Rhizosphere bacterial signalling: A love parade beneath our feet

Critical Reviews in Microbiology

Volumn 30, Issue 4, 2004, Pages 205-240

  Somers, E ^a   Vanderleyden, J ^a   Srinivasan, M ^b  

^a UNIVERSITY OF LEUVEN   (Belgium)

^b STATOIL   (Norway)

Author keywords

Azospirillum; Colonization; Plant Growth Promoting Bacteria

Indexed keywords

BACTERIAL POLYSACCHARIDE; BACTERIOCIN; NITRATE; PHYTOHORMONE;

AGRONOMY; AZOSPIRILLUM; BACTERIAL CELL; BACTERIAL COLONIZATION; BACTERIUM IDENTIFICATION; CELL COMMUNICATION; CELL SURFACE; CHEMOTAXIS; CLIMATE; GENE EXPRESSION; HARVEST; HORMONE SYNTHESIS; MICROBIAL DIVERSITY; MICROBIAL GROWTH; MICROBIAL POPULATION DYNAMICS; NITRATION; NITROGEN FIXATION; NONHUMAN; PLANT GROWTH; PLANT GROWTH PROMOTING RHIZOBACTERIUM; PLANT ROOT; PRIORITY JOURNAL; REDUCTION; RESEARCH; REVIEW; RHIZOBIACEAE; RHIZOSPHERE; SIGNAL TRANSDUCTION; SOIL;

AZOSPIRILLUM; PLANT ROOTS; PLANTS; SOIL MICROBIOLOGY; SYMBIOSIS;

AZOSPIRILLUM; BACTERIA (MICROORGANISMS); NEGIBACTERIA; RHIZOBIACEAE; RHIZOBIALES; RHIZOBIUM;

EID: 9344239899     PISSN: 1040841X     EISSN: None     Source Type: Journal    
DOI: 10.1080/10408410490468786     Document Type: Review

References (474)

1. Aarons, S., Abbas, A., Adams, C., Fenton, A., and O'Gara, F. 2000. A regulatory RNA (PrrB RNA) modulates expression of secondary metabolite genes in Pseudomonas fluorescens F113. J. Bacteriol. 182, 3913.
2. Alexandre, G., and Bally, R. 1999. Emergence of a laccase-positive variant of Azospirillum lipoferum occurs via a two-step phenotypic switching process, FEMS Microbiol. Lett. 174, 371.
3. Alexandre, G., and Zhulin, I.B. 2001. More than one way to sense chemicals. J. Bacteriol. 183, 4681.
4. Alexandre, G., Greer, S.E., and Zhulin, I.E. 2000. Energy taxis is the dominant behavior in Azospirillum brasilense. J. Bacteriol. 182, 6042.
5. Alexandre, G., Jacoud, D., Faure, D., and Bally, R. 1996. Population dynamics of a motile and non-motile Azospirillum lipoferum strain during rice colonization and motility variation in the rhizosphere. FEMS Microbiol. Ecol. 19, 278.
6. Alfano, J.R., and Collmer, A. 1997. The type III (Hrp) secretion pathway of plant pathogenic bacteria: Trafficking harpins, Avr proteins, and death. J. Bacteriol. 179, 5655.
7. Allaway, D., Schofield, N.A., Leonard, M.E., Gilardoni, L., Finan, T.M., and Poole, P.S. 2001. Use of differential fluorescence induction and optical trapping to isolate environmentally induced genes. Environ. Microbiol. 3, 397.
8. Amann, R., and Kuhl, M. 1998. In situ methods for assessment of microorganisms and their activities. Curr. Opin. Microbiol. 1, 352.
9. Andersen, J.B., Sternberg, C., Poulsen, L.K., Bjorn, S.P., Givskov, M., and Molin, S. 1998. New unstable variants of green fluorescent protein for studies of transient gene expression in bacteria. Appl. Environ. Microbiol. 64, 2240.
10. Ankenbauer, R.G., and Nester, E.W. 1990. Sugar-mediated induction of Agrobacterium tumefaciens virulence genes: Structural specificity and activities of monosaccharides. J. Bacteriol. 172, 6442.
11. Antonyuk, L., Fomina, O., Kalinina, A., Semenov, S., Nesmeyanova, M., and Ignatov, V. 1995. Wheat lectin possibly serves as a signal molecule in the Azospirillum-wheat association in Azospirillum VI and related microorganisms: Genetics, physiology, ecology, Fendrik, I., Del Gallo, M., Vanderleyden, J., and de Zamaroczy, M., Eds. Berlin Heidelberg.
12. Antoun, H., and Prevost, D. 2000. PGPA activity of Rhizobium with non-leguminous plants in Proceedings of the fifth International PGPR Workshop, Auburn University Web Site (http://www.ag.auburn.edu/argentina/ pdfmanuscripts/antoun.pdf).
13. Arsène, F., Katupitiya, S., Kennedy, I.R., and Elrnerich, C. 1994. Use of lacZ fusions to study the expression of nif genes of Azospirillum brasilense in association with plants. Mol. Plant Microbe Interact. 7, 748.
14. Ashby, A.M., Watson, M.D., Loake, G.J., and Shaw, C.H. 1988. Ti plasmid-specified chemotaxis of Agrobacterium tumefaciens C58C1 toward vir-inducing phenolic compounds and soluble factors from monocotyledonous and dicotyledonous plants. J. Bacteriol. 170, 4181.
15. Assmus, B., Hutzler, P., Amann, R., Lawrence, J.R., and Hartmann, A. 1995. In situ localization of Azospirillum brasilense in the rhizosphere of wheat with fluorescently labeled, rRNA-targeted oligonucleotide probes and scanning confocal lasser microscopy. Appl. Environ. Microbiol. 61, 1013.
16. Ausmees, N., Jacobsson, K., and Lindberg, M. 2001. A unipolarly located, cell-surface-associated agglutinin, RapA, belongs to a family of Rhizobium-adhering proteins (Rap) in Rhizobium leguminosarum bv. trifolii, Microbiology 147, 549.
17. Barak, R., Nur, I., Okon, Y., and Henis, Y. 1982. Tactic responses of Azospirillum brasilense towards oxygen and organic compounds. Isr. J. Bot. 31, 229.
18. Barber, C.E., Tang, J.L., Feng, J.X., Pan, M.Q., Wilson, T.J., Slater, H., Dow, J.M., Williams, P., and Daniels, M.J. 1997. A novel regulatory system required for pathogenicity of Xanthomonas campestris is mediated by a small diffusible signal molecule. Mol. Microbiol. 24, 555.
19. Bashan, Y., and De-Bashan, L.E. 2002. Protection of tomato seedlings against infection by Pseudomonas syringae pv. tomato by using the plant growth-promoting bacterium Azospirillum brasilense. Appl. Environ. Microbiol. 68, 2637.
20. Bashan, Y., and Holguin, G. 1994. Inter-root movement of Azospirillum brasilense and subsequent root colonization of crop and weed seedlings growing in soil. Microb. Ecol. 29, 269.
21. Bashan, Y., and Holguin, G. 1994. Root-to-root travel of the beneficial bacterium Azospirillum brasilense. Appl. Environ. Microbiol. 60, 2120.
22. Bashan, Y., and Levanony, H. 1988. Interaction between Azospirillum Cd and wheat root cells during early stages of root colonization in Azospirillum IV: Genetics, Physiology, Ecology, Klingmüller, W., Ed. Berlin Heidelberg.
23. Bashan, Y., and Levanony, H. 1987. Horizontal and vertical movement of Azospirillum brasilense Cd in the soil and along the rhizosphere of wheat and weeds in controlled and field environments. J. Gen. Microbiol. 133, 3473.
24. Bashan, Y. 1999. Interactions of Azospirillum spp. in soils: A review. Biol. Fertil. Soils 29, 246.
25. Bashan, Y. 1986. Migration of the rhizosphere bacteria Azospirillum brasilense and Pseudomonas fluorescens towards wheat roots in the soil. J. Gen. Microbiol. 132, 3407.
26. Bashan, Y., Puente, M.E., Rodriguez-Mendoza, M.N., Holguin, G., Toledo, G., Ferrera-Cerrato, R., and Pedrin, S. 1995. Soil parameters which affect the survival of Azospirillum brasilense in Azospirillum VI and related organisms: Genetics, physiology, ecology, Fendrik, I., Del Gallo, M., Vanderleyden, J., and de Zamaroczy, M., Eds. Berlin Heidelberg.
27. Bashan, Y., Puente, M.E., Rodriguez-Mendoza, M.N., Toledo, G., Holguin, G., Ferrera-Cerrato, R., and Pedrin, S. 1995. Survival of Azospirillum brasilense in the bulk soil and rhizosphere of 23 soil types. Appl. Environ. Microbiol. 61, 1938.
28. Bassler, B.L. 1999. How bacteria talk to each other: Regulation of gene expression by quorum sensing. Curr. Opin. Microbiol. 2, 582.
29. Bauer, W.D., and Caetano-Anolles, G. 1991. Chemotaxis, induced gene expression and competitiveness in the rhizosphere in The rhizosphere and plant growth, Keister, D.L., and Cregan, P.B., Eds. Dordrecht.
30. Bauer, W.D., and Robinson, J.B. 2002. Disruption of bacterial quorum sensing by other organisms. Curr. Opin. Biotechnol. 13, 234.
31. Bayliss, C., Bent, E., Culham, D.E., MacLellan, S., Clarke, A.J., Brown, G.L., and Wood, J.M. 1997. Bacterial genetic loci implicated in the Pseudomonas putida GR12-2R3-canola mutualism: Identification of an exudate-inducible sugar transporter. Can. J. Microbiol. 43, 809.
32. Beare, P.A., For, R.J., Martin, L.W., and Lamont, I.L. 2003. Siderophore-mediated cell signalling in Pseudomonas aeruginosa: Divergent pathways regulate virulence factor production and siderophore receptor synthesis. Mol. Microbiol. 47, 195.
33. Becker, D., Stanke, R., Fendrik, I., Frommer, W.B., Vanderleyden, J., Kaiser, W.M., and Hedrich, R. 2002. Expression of the NH(+)(4)-transporter gene LEAMT1; 2 is induced in tomato roots upon association with N(2)-fixing bacteria. Planta 215, 424.
34. Becquart-deKozak, I., Reuhs, B.L., Buffard, D., Breda, C., Kim, J.S., Esnault, R., and Kondorosi, A. 1997. Role of the K-antigen subgroup of capsular polysaccharides in the early recognition process between Rhizobium meliloti and alfalfa leaves. Mol. Plant Microbe Interact. 10, 114.
35. Bekri, M.A., Desair, J., Keijers, V., Proost, P., Searle-van Leeuwen, M., Vanderleyden, J., and Vande Broek, A. 1999. Azospirillum irakense produces a novel type of pectate lyase. J. Bacteriol. 181, 2440.
36. Benizri, E., Baudoin, E., and Guckert, A. 2001. Root colonization by inoculated plant growth-promoting rhizobacteria. Biocontrol Sci. Techn. 11, 557.
37. Benizri, E., Dedourge, O., Dibattista-Leboef, C., Piutti, S., Nguyen, C., and Guckert, A. 2002. Effect of maize rhizodeposits on soil microbial community structure. Appl. Soil Ecol. 21, 261.
38. Bergman, K., Gulash-Hoffee, M., Hovestadt, R.E., Larosiliere, R.C., Ronco, P.G., and Su, L. 1988. Physiology of behavioral mutants of Rhizobium meliloti: Evidence for a dual chemotaxis pathway. J. Bacteriol. 170, 3249.
39. Binns, A.N., and Thomashow, M.F. 1988. Cell biology of Agrobacterium infection and transformation of plants. Annu. Rev. Microbiol. 42, 575.
40. Bloemberg, G.V., and Lugtenberg, B.J. 2001. Molecular basis of plant growth promotion and biocontrol by rhizobacteria. Curr. Opin. Plant Biol. 4, 343.
41. Bloemberg, G.V., O'toole, G.A., Lugtenberg, B.J., and Kolter, R. 1997. Green fluorescent protein as a marker for Pseudomonas spp. Appl. Environ. Microbiol. 63, 4543.
42. Bloemberg, G.V., Wijfjes, A.H., Lamers, G.E., Stuurman, N., and Lugtenberg, B.J. 2000. Simultaneous imaging of Pseudomonas fiuorescens WCS365 populations expressing three different autofluorescent proteins in the rhizosphere: New perspectives for studying microbial communities. Mol. Plant Microbe Interact. 13, 1170.
43. Blumer, C., Heeb, S., Pessi, G., and Haas, D. 1999. Global GacA-steered control of cyanide and exoprotease production in Pseudomonas fluorescent involves specific ribosome binding sites. Proc. Natl. Acad. Sci. USA, 96, 14073.
44. Bohin, J.P. 2000. Osmoregulated periplasmic glucans in Proteobacteria. FEMS Microbiol. Lett. 186, 11.
45. Bolton, G.W., Nester, E.W., and Gordon, M.P. 1986. Plant phenolic compounds induce expression of the Agrobacterium tumefaciens loci needed for virulence. Science 232, 983.
46. Bottini, R., Fulchieri, M., Pearce, D., and Pharis, R.P. 1989. Identification of gibberelins A1, A3, and iso-A3 in cultures of Azospirillum lipoferum. Plant Physiol. 90, 45.
47. Bowen, G.D. 1991. Microbial dynamics in the rhizosphere: Possible strategies in managing rhizosphere populations in The rhizosphere and plant growth, Keister, D.L., and Cregan, P.B., Eds. Dordrecht.
48. Braun, V., and Killmann, H. 1999. Bacterial solutions to the iron-supply problem. Trends Biochem. Sci. 24, 104.
49. Bringhurst, R.M., Cardon, Z.G., and Gage, D.J. 2001. Galactosides in the rhizosphere: Utilization by Sinorhizobium meliloti and development of a biosensor. Proc. Natl. Acad. Sci. USA 98, 4540.
50. Broughton, W.J., and Perret, X. 1999. Genealogy of legume-Rhizobium symbioses. Curr. Opin. Plant Biol. 2, 305.
51. Broughton, W.J., Jabbouri, S., and Perret, X. 2000. Keys to symbiotic harmony. J. Bacteriol. 182, 5641.
52. Buell, C.R., and Andersen, A.J. 1992. Genetic analysis of the aggA locus involved in agglutination and adherence of Pseudomonas putida, a beneficial fluorescent pseudomonad. Mol. Plant Microbe Interact. 5, 154.
53. Burdman, S., Dulguerova, G., Okon, Y., and Jurkevitch, E. 2001. Purification of the major outer membrane protein of Azospirillum brasilense, its affinity to plant roots, and its involvement in cell aggregation. Mol. Plant Microbe Interact. 14, 555.
54. Burdman, S., Jurkevitch, E., Schwartsburd, B., and Okon, Y. 1999. Involvement of outer-membrane proteins in the aggregation of Azospirillum brasilense. Microbiology 145, 1145.
55. Burdman, S., Jurkevitch, E., Schwartsburd, B., Hampel, M., and Okon, Y. 1998. Aggregation in Azospirillum brasilense: Effects of chemical and physical factors and involvement of extracellular components. Microbiology 144, 1989.
56. Burdman, S., Jurkevitch, E., Soria-Diaz, M.E., Serrano, A.M., and Okon, Y. 2000. Extracellular polysaccharide composition of Azospirillum brasilense and its relation with cell aggregation. FEMS Microbiol. Lett. 189, 259.
57. Burdman, S., Okon, Y., and Jurkevitch, E. 2000. Surface characteristics of Azospirillum brasilense in relation to cell aggregation and attachment to plant roots. Crit. Rev. Microbiol. 26, 91.
58. Burmolle, M., Hansen, L.H., Oregaard, G., and Sorensen, S.J. 2003. Presence of N-acyl homoserine lactones in soil detected by a whole-cell biosensor and flow cytometry. Microb. Ecol. 45, 226.
59. Buttner, D., and Bonas, U. 2002. Getting across-bacterial type III effector proteins on their way to the plant cell. EMBO J. 21, 5313.
60. Camacho Carvajal, M.M., Wijfjes, A.M., Mulders, I.H., Lugtenberg, B.J., and Bloemberg, G.V. 2002. Characterization of NADH dehydrogenases of Pseudomonas fluorescens WCS365 and their role in competitive root colonization. Mol. Plant Microbe Interact. 15, 662.
61. Camilli, A., Beattie, D.T., and Mekalanos, J.J. 1994. Use of genetic recombination as a reporter of gene expression. Proc. Natl. Acad. Sci. USA 91, 2634.
62. Casavant, N.C., Beattie, G.A., Phillips, G.J., and Halverson, L.J. 2002. Site-specific recombination-based genetic system for reporting transient or low-level gene expression. Appl. Environ. Microbiol. 68, 3588.
63. Castaneda, M., Guzman, J., Moreno, S., and Espin, G. 2000. The GacS sensor kinase regulates alginate and poly-beta-hydroxybutyrate production in Azotobacter vinelandii. J. Bacteriol. 182, 2624.
64. Castaneda, M., Sanchez, J., Moreno, S., Nunez, C., and Espin, G. 2001. The global regulators GacA and sigma(S) form part of a cascade that controls alginate production in Azotobacter vinelandii. J. Bacteriol. 183, 6787.
65. Castellanos, T., Ascencio, F., and Bashan, Y. 1998. Cell-surface lectins of Azospirillum spp. Curr. Microbiol. 36, 241.
66. Cha, C., Gao, P., Chen, Y.C., Shaw, P.D., and Farrand, S.K. 1998. Production of acyl-homoserine lactone quorum-sensing signals by gram-negative plant-associated bacteria. Mol. Plant Microbe Interact. 11, 1119.
67. Chabeaud, P., de Groot, A., Bitter, W., Tommassen, J., Heulin, T., and Achouak, W. 2001. Phase-variable expression of an operon encoding extracellular alkaline protease, a serine protease homolog, and lipase in Pseudomonas brassicacearum. J. Bacteriol. 183, 2117.
68. Chabot, R., Antoun, H., Kloepper, J.W., and Beauchamp, C.J. 1996. Root colonization of maize and lettuce by bioluminescent Rhizobium leguminosarum biovar phaseoli. Appl. Environ. Microbiol. 62, 2767.
69. Chabot, R., Beauchamp, C.J., Kloepper, J.W., and Antoun, H. 1998. Effect of phosphorus on root colonization and growth promotion of maize by bioluminescent mutants of phosphate solubilizing Rhizobium leguminosarum biovar phaseoli. Soil Biol. Biochem. 30, 1615.
70. Chalfie, M., Tu, Y., Euskirchen, G., Ward, W.W., and Prasher, D.C. 1994. Green fluorescent protein as a marker for gene expression. Science 263, 802.
71. Chancey, ST., Wood, D.W., and Pierson, L.S., III. 1999. Two-component transcriptional regulation of N-acyl-homoserine lactone production in Pseudomonas aureofaciens. Appl. Environ. Microbiol. 65, 2294.
72. Chancey, S.T., Wood, D.W., Pierson, E.A., and Pierson, L.S., III. 2002. Survival of GacS/GacA mutants of the biological control bacterium Pseudomonas aureofaciens 30-84 in the wheat rhizosphere. Appl. Environ. Microbiol. 68, 3308.
73. Chen, X., Schauder, S., Potier, N., Van Dorsselaer, A., Pelczer, I., Bassler, B.L., and Hughson, F.M. 2002. Structural identification of a bacterial quorum-sensing signal containing boron. Nature 415, 545.
74. Cheng, H.P., and Walker, G.C. 1998a. Succinoglycan is required for initiation and elongation of infection threads during nodulation of alfalfa by Rhizobium meliloti. J. Bacteriol. 180, 5183.
75. Cheng, H.P., and Walker, G.C. 1998b. Succinoglycan production by Rhizobium meliloti is regulated through the ExoS-Chv1 two-component regulatory system. J. Bacteriol. 180, 20.
76. Chet, I., Ordentlich, A., Shapira, R., and Oppenheim, A. 1991. Mechanisms of biocontrol of soil-born plant pathogens by rhizobacteria in The rhizosphere and plant growth, Keister, D.L., and Cregan, P.B., Eds. Dordrecht.
77. Chin-A-Woeng, T.F.C., Bloemberg, G.V., Mulders, I.H., Dekkers, L.C., and Lugtenberg, B.J. 2000. Root colonization by phenazine-1-carboxamide-producing bacterium Pseudomonas chlororaphis PCL1391 is essential for biocontrol of tomato foot and root rot. Mol. Plant Microbe Interact. 13, 1340.
78. Chin-A-Woeng, T.F.C., de Priester, W., van de Bij, A.J., and Lugtenberg, B.J.J. 1997. Description of the colonization of a gnotobiotic tomato rhizospere by Pseudomonasfluorescens biocontrol strain WCS365, using scanning electron microscopy. Mol. Plant Microbe Interact. 10, 79.
79. Chin-A-Woeng, T.F.C., van den Broek, D., de Voer, G., van der Drift, K.M., Tuinman, S., Thomas-Oates, J.E., Lugtenberg, B.J., and Bloemberg, G.V. 2001. Phenazine-1-carboxamide production in the biocontrol strain Pseudomonas chlororaphis PCL1391 is regulated by multiple factors secreted into the growth medium. Mol. Plant Microbe Interact. 14, 969.
80. Clarke, H.R., Leigh, J.A., and Douglas, C.J. 1992. Molecular signals in the interactions between plants and microbes. Cell 71, 191.
81. Cook, R.J., Thomashow, L.S., Weller, D.M., Fuiimoto, D., Mazzola, M., Bangera, G., and Kim, D. 1995. Molecular mechanisms of defense by rhizobacteria against root disease. Proc. Natl. Acad. Sci. USA 92, 4197.
82. Cornelis, P., and Matthijs, S. 2002. Diversity of siderophore-mediated iron uptake systems in fluorescent pseudomonads: Not only pyoverdines. Environ. Microbiol. 4, 787.
83. Croes, C.L., Moens, S., Van Bastelaere, E., Vanderleyden, J., and Michiels, K.W. 1993. The polar flagellum mediates Azospirillum brasilense adsorption to wheat roots. J. Gen. Microbiol. 139, 2261.
84. Croes, C., Van Bastelaere, E., DeClercq, E., Eyers, M., Vanderleyden, J., and Michiels, K. 1991. Identification and mapping of loci involved in motility, adsorption to wheat roots, colony morphology, and growth in minimal medium on the Azospirillum brasilense Sp7 90-MDa plasmid. Plasmid 26, 83.
85. Currier, W.W., and Strobel, G.A. 1977. Chemotaxis of Rhizobium spp. to a glycoprotein produced by birdsfoot trefoil roots. Science 196, 434.
86. Currier, W.W. 1980. Chemotaxis of a birdsfoot trefoil strain of Rhizobium to simple sugars. FEMS Microbiol. Lett. 8, 43.
87. Czuprynski, C.J., and Welch, R.A. 1995. Biological effects of RTX toxins: The possible role of lipopoly saccharide. Trends Microbiol. 3, 480.
88. Dakora, F.D., and Phillips, D.A. 2002. Root exudates as mediators of mineral acquisition in low-nutrient environments. Plant Soil 245, 35.
89. Daniels, R., De Vos, D.E., Desair, J., Raedschelders, G., Luyten, E., Rosemeyer, V., Verreth, C., Schoeters, E., Vanderleyden, J., and Michiels, J. 2002. The cin quorum sensing locus of Rhizobium etli CNPAF512 affects growth and symbiotic nitrogen fixation. J. Biol. Chem. 277, 462.
90. Daunert, S., Barrett, G., Feliciano, J.S., Shetty, R.S., Shrestha, S., and Smith-Spencer, W. 2000. Genetically engineered whole-cell sensing systems: Coupling biological recognition with reporter genes. Chem. Rev. 100, 2705.
91. Davey, M.E., and O'toole, G.A. 2000, Microbial biofilms: From ecology to molecular genetics. Microbiol. Mol. Biol. Rev. 64, 847.
92. Dazzo, F.B., and Hubbell, D.H. 1975. Cross-reactive antigens and lectin as determinants of symbiotic specificity in the Rhizobium-clover association. Appl. Microbiol. 30, 1017.
93. De Bellis, P., and Ercolani, G.L. Growth interactions during bacterial colonization of seedling rootlets. Appl. Environ. Microbiol. 67, 1945, 2001.
94. De Coninck, K., Horemans, S., Randombage, S., and Vlassak, K. 1988. Occurrence and survival of Azospirillum spp. in temperate regions. Plant Soil 110, 213.
95. De Mot, R., Proost, P., Van Damme, J., and Vanderleyden, J. 1992. Homology of the root adhesin of Pseudomonas fluorescens OE 28.3 with porin F of P. aeruginosa and P. syringae. Mol. Gen. Genet. 231, 489.
96. de Rudder, K.E., Sohlenkamp, C., and Geiger, O. 1999. Plant-exuded choline is used for rhizobial membrane lipid biosynthesis by phosphatidylcholine synthase. J. Biol. Chem. 274, 20011.
97. de Weert, S., Vermeiren, H., Mulders, I.H., Kuiper, I., Hendrickx, N., Bloemberg, G.V., Vanderleyden, J., De Mot, R., and Lugtenberg, B.J. 2002. Flagella-driven chemotaxis towards exudate components is an important trait for tomato root colonization by Pseudomonas fluorescens. Mol. Plant Microbe Interact. 15, 1173.
98. de Weger, L.A., Bloemberg, G.V., van Wezel, T., van Raamsdonk, M., Glandorf, D.C., van Vuurde, J., Jann, K., and Lugtenberg, B.J. 1996. A novel cell surface polysaccharide in Pseudomonas putida WCS358, which shares characteristics with Escherichia coli K antigens, is not involved in root colonization. J. Bacteriol. 178, 1955.
99. de Weger, L.A., van der Bij, A.J., Dekkers, L.C., Simons, M., Wijffelman, C.A., and Lugtenberg, B.J.J. 1995. Colonization of the rhizosphere of crop plants by plant-beneficial pseudomonads. FEMS Microbiol. Ecol. 17, 221.
100. de Weger, L.A., van der Vlugt, C.I., Wijfjes, A.H., Bakker, P.A., Schippers, B., and Lugtenberg, B. 1987. Flagella of a plant-growth-stimulating Pseudomonas fluorescens strain are required for colonization of potato roots. J. Bacteriol. 169, 2769.
101. Dekkers, L.C., Bloemendaal, C.J., de Weger, L.A., Wijffelman, C.A., Spaink, H.P., and Lugtenberg, B.J. 1998. A two-component system plays an important role in the root-colonizing ability of Pseudomonas fluorescens strain WCS365. Mol. Plant Microbe Interact. 11, 45.
102. Dekkers, L.C., Mulders, I.H., Phoelich, C.C., Chin, A.W.T., Wijfjes, A.M., and Lugtenberg, B.J. 2000. The sss colonization gene of the tomato-Fusarium oxysporum f. sp. radicis-lycopersici biocontrol strain Pseudomonas fluorescens WCS365 can improve root colonization of other wild-type Pseudomonas spp. bacteria. Mol. Plant Microbe Interact. 13, 1177.
103. Dekkers, L.C., Phoelich, C.C., van der Fits, L., and Lugtenberg, B.J. 1998. A site-specific recombinase is required for competitive root colonization by Pseudomonas fluorescens WCS365. Proc. Natl. Acad. Sci. USA 95, 7051.
104. Dekkers, L.C., van der Bij, A.J., Mulders, I.H., Phoelich, C.C., Wentwoord, R.A., Glandorf, D.C., Wijffelman, C.A., and Lugtenberg, B.J. 1998. Role of the O-antigen of lipopolysaccharide, and possible roles of growth rate and of NADH:ubiquinone oxidoreductase (nuo) in competitive tomato root-tip colonization by Pseudomonas fluorescens WCS365. Mol. Plant Microbe Interact. 11, 763.
105. Del Gallo, M., and Fendrik, I. 1994. The rhizosphere and Azospirillum in Azospirillum/plant associations, Okon, Y., Ed. Boca Raton, Florida.
106. Diaz, C.L., Melchers, L.S., Hooykaas, P.J.J., Lugtenberg, B.J.J., and Kijne, J.W. 1989. Root lectin as a determinant of host-plant specificity in the Rhizobium-legume symbiosis. Nature 338, 579.
107. Dobbelaere, S., Croonenborghs, A., Thys, A., and Vande Broek, A. 1999. Phytostimulatory effect of Azospirillum brasilense wild type and mutant strains altered in IAA production on wheat. Plant Soil 212.
108. Dobbelaere, S., Croonenborghs, A., Thys, A., Ptacek, D., Vanderleyden, J., Dutto, P., Labandera-Gonzalez, C., Caballero-Mellado, J., Francisco Aguirre, J., Kapulnik, Y., Brener, S., Burdman, S., Kadouri, D., Sarig, S., and Okon, Y. 2001. Responses of agronomically important crops to inoculation with Azospirillum. Aust. J. Plant Physiol. 28, 871.
109. Dobbelaere, S. 2002. Phytostimulatory effect of Azospirillum, PhD Dissertation K.U. Leuven, Belgium.
110. Döbereiner, J., Baldani, V.L.D., and Reis, V.M. 1995. Endophytic occurence of diazotrophic bacteria in non-leguminous crops in Azospirillum VI and related microorganisms: Genetics, physiology, ecology, Fendrik, I., Del Gallo, M., Vanderleyden, J., and de Zamaroczy, M., Eds. Berlin Heidelberg.
111. Dong, Y.H., Gusti, A.R., Zhang, Q., Xu, J.L., and Zhang, L.H. 2002. Identification of quorum-quenching N-acyl homoserine lactonases from Bacillus species. Appl. Environ. Microbiol. 68, 1754.
112. Dong, Y.H., Wang, L.H., Xu, J.L., Zhang, H.B., Zhang, X.F., and Zhang, L.H. 2001. Quenching quorum-sensing-dependent bacterial infection by an N-acyl homoserine lactonase. Nature 411, 813.
113. Dong, Y.H., Xu, J.L., Li, X.Z., and Zhang, L.H. 2000. AiiA, an enzyme that inactivates the acylhomoserine lactone quorum-sensing signal and attenuates the virulence of Erwinia carotovora. Proc. Natl. Acad. Sci. USA 97, 3526.
114. Dorr, J., Hurek, T., and Reinhold-Hurek, B. 1998. Type IV pili are involved in plant-microbe and fungus-microbe interactions. Mol. Microbiol. 30, 7.
115. Dow, M., Newman, M.A., and von Roepenack, E. 2000. The induction and modulation of plant defense responses by bacterial lipopolysaccharides. Annu. Rev. Phytopathol. 38, 241.
116. Duffy, B.K., and Defago, G. 2000. Controlling instability in gacS-gacA regulatory genes during inoculant production of Pseudomonas fluorescens biocontrol strains. Appl. Environ. Microbiol. 66, 3142.
117. Duineveld, B.M., Rosado, A.S., Van Elsas, J.D., and van Veen, J.A. 1998. Analysis of the dynamics of bacterial communities in the rhizosphere of the chrysanthemum via denaturing gradient gel electrophoresis and substrate utilization patterns. Appl. Environ. Microbiol. 64, 4950.
118. Dunn, A.K., and Handelsman, J. 2002. Toward an understanding of microbial communities through analysis of communication networks. Antonie Van Leeuwenhoek 81, 565.
119. Dunn, A.K., Klimowicz, A.K., and Handelsman, J. 2003. Use of a promoter trap to identify Bacillus cereus genes regulated by tomato seed exudate and a rhizosphere resident, Pseudomonas aureofaciens. Appl. Environ. Microbiol. 69, 1197.
120. Dylan, T., Ielpi, L., Stanfield, S., Kashyap, L., Douglas, C., Yanofsky, M., Nester, E., Helinski, D.R., and Ditta, G. 1986. Rhizobium meliloti genes required for nodule development are related to chromosomal virulence genes in Agrobacterium tumefaciens. Proc. Natl. Acad. Sci. USA 83, 4403.
121. Eckert, B., Weber, O.B., Kirchhof, G., Halbritter, A., Hartmann, A., and Hartmann, A. 2001. Azospirillum doebereinerae sp. nov., a nitrogen-fixing bacterium associated with the C4-grass Miscanthus. Int. J. Syst. Evol. Microbiol. 51, 17.
122. Elasri, M., Delorme, S., Lemanceau, P., Stewart, G., Laue, B., Glickmann, E., Oger, P.M., and Dessaux, Y. 2001. Acyl-homoserine lactone production is more common among plant-associated Pseudomonas spp. than among soil-borne Pseudomonas spp. Appl. Environ. Microbiol. 67, 1198.
123. Entcheva, P., Phillips, D.A., and Streit, W.R. 2002. Functional analysis of Sinorhizobium meliloti genes involved in biotin synthesis and transport. Appl. Environ. Microbiol. 68, 2843.
124. Eriksson, A.R., Andersson, R.A., Pirhonen, M., and Palva, E.T. 1998. Two-component regulators involved in the global control of virulence in Erwinia carotovora subsp. carotovora. Mol. Plant Microbe Interact. 11, 743.
125. Errampalli, D., Leung, K., Cassidy, M.B., Kostrzynska, M., Blears, M., Lee, H., and Trevors, J.T. 1999. Applications of the green fluorescent protein as a molecular marker in environmental microorganisms. J. Microbiol. Methods 35, 187.
126. Espinosa-Urgel, M., and Ramos, J.L. 2001. Expression of a Pseudomonas putida aminotransferase involved in lysine catabolism is induced in the rhizosphere. Appl. Environ. Microbiol. 67, 5219.
127. Espinosa-Urgel, M., Kolter, R., and Ramos, J.L. 2002. Root colonization by Pseudomonas putida: Love at first sight. Microbiology 148, 341.
128. Espinosa-Urgel, M., Salido, A., and Ramos, J.L. 2000. Genetic analysis of functions involved in adhesion of Pseudomonas putida to seeds. J. Bacteriol. 182, 2363.
129. Fan, T.W., Lane, A.N., Shenker, M., Bartley, J.P., Crowley, D., and Higashi, R.M. 2001. Comprehensive chemical profiling of gramineous plant root exudates using high-resolution NMR and MS. Phytochemistry 57, 209.
130. Faure, D., Desair, J., Keijers, V., Bekri, M.A., Proost, P., Henrissat, B., and Vanderleyden, J. 1999. Growth of Azospirillum irakense KBCl on the aryl beta-glucoside salicin requires either salA or salB. J. Bacteriol. 181, 3003.
131. Faure, D., Henrissat, B., Ptacek, D., Bekri, M.A., and Vanderleyden, J. 2001. The celA gene, encoding a glycosyl hydrolase family 3 beta-glucosidase in Azospirillum irakense, is required for optimal growth on cellobiosides. Appl. Environ. Microbiol. 67, 2380.
132. Fedi, S., Montaini, P., and Favilli, F. 1992. Chemotactic response of Azospirillum toward root exudates of C3 and C4 plants. Symbiosis 13, 101.
133. Ferraioli, S., Tate, R., Caputo, E., Lamberti, A., Riccio, A., and Patriarca, E.J. 2001. The Rhizobium etli argC gene is essential for arginine biosynthesis and nodulation of Phaseolus vulgaris. Mol. Plant Microbe Interact. 14, 250.
134. Ferraioli, S., Tate, R., Cermola, M., Favre, R., Iaccarino, M., and Patriarca, E.J. 2002. Auxotrophic mutant strains of Rhizobium etli reveal new nodule development phenotypes. Mol. Plant Microbe Interact. 15, 501.
135. Fischer, S.E., Miguel, M.J., and Mori, G.B. 2003. Effect of root exudates on the exopolysaccharide composition and the lipopolysaccharide profile of Azospirillum brasilense Cd under saline stress. FEMS Microbiol. Lett. 219, 53.
136. Fischer, S., Rivarola, V., and Mori, G. 1999. Saline stress alters the gene expression of Azospirillum brasilense Cd. Microbios 100, 83.
137. Fisher, R.F., and Long, S.R. 1992. Rhizobium-plant signal exchange. Nature 357, 655.
138. Flagan, S., Ching, W.K., and Leadbetter, J.R. 2003. Arthrobacter strain VAI-A utilizes acyl-homoserine lactone inactivation products and stimulates quorum signal biodegradation by Variovorax paradoxus. Appl. Environ. Microbiol. 69, 909.
139. Flavier, A.B., Clough, S.J., Schell, M.A., and Denny, T.P. 1997. Identification of 3-hydroxypalmitic acid methyl ester as a novel autoregulator controlling virulence in Ralstonia solanacearum. Mol. Microbiol. 26, 251.
140. Forsberg, L.S., and Reuhs, B.L. 1997. Structural characterization of the K antigens from Rhizobium fredii USDA257: Evidence for a common structural motif, with strain-specific variation, in the capsular polysaccharides of Rhizobium spp. J. Bacteriol. 179, 5366.
141. Fray, R.G. 2002. Altering plant-microbe interaction through artificially manipulating bacterial quorum sensing. Ann. Bot. (Lond) 89, 245.
142. Fray, R.G., Throup, J.P., Daykin, M., Wallace, A., Williams, P., Stewart, G.S.A.B., and Grierson, D. 1999. Plants genetically modified to produce N-acylhomoserine lactones communicate with bacteria. Nat. Biotechnol. 17, 1017.
143. Fraysse, N., Couderc, F., and Poinsot, V. 2003. Surface polysaccharide involvement in establishing the Rhizobium-legume symbiosis. Eur. J. Biochem. 270, 1365.
144. Fry, J., Wood, M., and Poole, P.S. 2001. Investigation of myo-inositol catabolism in Rhizobium leguminosarum bv. viciae and its effect on nodulation competitiveness. Mol. Plant Microbe Interact. 14, 1016.
145. Fuqua, C., Parsek, M.R., and Greenberg, E.P. 2001. Regulation of gene expression by cell-to-cell communication: Acyl-homoserine lactone quorum sensing. Annu. Rev. Genet. 35, 439.
146. Fuqua, C., Winans, S.C., and Greenberg, E.P. 1996. Census and consensus in bacterial ecosystems: The LuxR-LuxI family of quorum-sensing transcriptional regulators. Annu. Rev. Microbiol. 50, 727.
147. Gal, M., Preston, G.M., Massey, R.C., Spiers, A.J., and Rainey, P.B. 2003. Genes encoding a cellulosic polymer contribute toward the ecological success of Pseudomonas fluorescens SBW25 on plant surfaces. Mol. Ecol. 12, 3109.
148. Galbraith, M.P., Feng, S.F., Borneman, J., Triplett, E.W., de Bruijn, F.J., and Rossbach, S. 1998. A functional myo-inositol catabolism pathway is essential for rhizopine utilization by Sinorhizobium meliloti. Microbiology 144, 2915.
149. Gardener, B.B.M., and de Bruijn, F.J. 1998. Detection and isolation of novel rhizopine-catabolizing bacteria from the environment. Appl. Environ. Microbiol. 64, 4944.
150. Gaworzewska, E.T., and Carlile, M.J. 1982. Positive chemotaxis of Rhizobium leguminosarum and other bacteria towards root exudates from legumes and other plants. J. Gen. Microbiol. 128, 1179.
151. Ghiglione, J.F., Gourbiere, F., Potier, P., Philippot, L., and Lensi, R. 2000. Role of respiratory nitrate reductase in ability of Pseudomonas fluorescens YT101 to colonize the rhizosphere of maize. Appl. Environ. Microbiol. 66, 4012.
152. Givskov, M., de Nys, R., Manefield, M., Gram, L., Maximilien, R., Eberl, L., Molin, S., Steinberg, P.D., and Kjelleberg, S. 1996. Eukaryotic interference with homoserine lactone-mediated prokaryotic signalling. J. Bacteriol. 178, 6618.
153. Goldmann, A., Boivin, C., Fleury, V., Message, B., Lecoeur, L., Maille, M., and Tepfer, D. 1991. Betaine use by rhizosphere bacteria: Genes essential for trigonelline, stachydrine, and carnitine catabolism in Rhizobium meliloti are located on pSym in the symbiotic region. Mol Plant Microbe Interact. 4, 571.
154. Goldmann, A., Lecoeur, L., Message, B., Delarue, M., Schoonejans, E., and Tepfer, D. 1994. Symbiotic plasmid genes essential to the catabolism of proline betaine, or stachydrine, are also required for efficient nodulation by Rhizobium meliloti. FEMS Microbiol. Lett. 115, 305.
155. Gonzalez, J.E., Reuhs, B.L., and Walker, G.C. 1996. Low molecular weight EPS II of Rhizobium meliloti allows nodule invasion in Medicago sativa. Proc. Natl. Acad. Sci. USA 93, 8636.
156. Gordon, D.M., Ryder, M.H., Heinrich, K., and Murphy, P.J. 1996. An experimental test of the rhizopine concept in Rhizobium meliloti. Appl. Environ. Microbiol. 62, 3991.
157. Gottfert, M., Grob, P., and Hennecke, H. 1990. Proposed regulatory pathway encoded by the nodV and nodW genes, determinants of host specificity in Bradyrhizobium japonicum. Proc. Natl. Acad. Sci. USA 87, 2680.
158. Gottfert, M., Rothlisberger, S., Kundig, C., Beck, C., Marty, R., and Hennecke, H. 2001. Potential symbiosis-specific genes uncovered by sequencing a 410-kilobase DNA region of the Bradyrhizobium japonicum chromosome. J. Bacteriol. 183, 1405.
159. Gray, K.M. 1997. Intercellular communication and group behavior in bacteria. Trends Microbiol. 5, 184.
160. Grayston, S.J., Vaughan, D., and Jones, D. 1997. Rhizosphere carbon flow in trees, in comparison with annual plants: The importance of root exudation and its impact on microbial activity and nutrient availability. Appl. Soil Ecol. 5, 29.
161. Grayston, S.J., Wang, S.Q., Campbell, C.D., and Edwards, A.C. 1998. Selective influence of plant species on microbial diversity in the rhizosphere. Soil Biol. Biochem. 30, 369.
162. Grishanin, R.N., Chalmina, I.I., and Zhulin, I.B. 1991. Behaviour of Azospirillum brasilense in a spatial gradient of oxygen and in a redox gradient of an artificial electron acceptor. J. Gen. Microbiol. 137, 2781.
163. Grob, P., Michel, P., Hennecke, H., and Gottfert, M. 1993. A novel response-regulator is able to suppress the nodulation defect of a Bradyrhizobium japonicum nodW mutant. Mol. Gen. Genet. 241, 531.
164. Gu, Y.-H., and Mazzola, M. 2001. Impact of carbon starvation on stress resistance, survival in soil habitats and biocontrol ability of Pseudomonas putida strain 2C8. Soil Biol. Biochem. 33, 1155.
165. Guntli, D., Heeb, M., Moënne-Loccoz, Y., and Defago, G. 1999. Contribution of calystegine catabolic plasmid to competitive colonization of calystegine-producing plants by Sinorhizobium meliloti Rm41. Mol. Ecol. 8, 855.
166. Haas, D., Blumer, C., and Keel, C. 2000. Biocontrol ability of fluorescent pseudomonads genetically dissected: Importance of positive feedback regulation. Curr. Opin. Biotechnol. 11, 290.
167. Hall, P.G., and Krieg, N.R. 1983. Swarming of Azospirillum brasilense on solid media. Can. J. Microbiol. 29, 1592.
168. Handelsman, J., and Stabb, E.V. 1996. Biocontrol of soilborne plant pathogens. Plant Cell 8, 1855.
169. Handfield, M., and Levesque, R.C. 1999. Strategies for isolation of in vivo expressed genes from bacteria. FEMS Microbiol. Rev. 23, 69.
170. Hartmann, A., and Zimmer, W. 1994. Physiology of Azospirillum in Azospirillum/plant associations, Okon, Y., Ed. Boca Raton.
171. Hartmann, A. 1988. Osmoregulatory properties of Azospirillum sp. in Azospirillum IV: Genetics, physiology, ecology, Klingmüller, W., Ed. Berlin Heidelberg.
172. Hartwig, U.A., and Phillips, D.A. 1991. Release and modification of nod-gene-inducing flavonoids from alfalfa seeds. Plant Physiol. 95, 804.
173. Hauwaerts, D., Alexandre, G., Das, S.K., Vanderleyden, J., and Zhulin, I.B. 2002. A major chemotaxis gene cluster in Azospirillum brasilense and relationships between chemotaxis operons in alpha-proteobacteria. FEMS Microbiol. Lett. 208, 61.
174. Hawes, M.C., and Smith, L.Y. 1989. Requirement for chemotaxis in pathogenicity of Agrobacterium tumefaciens on roots of soil-grown pea plants. J. Bacteriol. 171, 5668.
175. Hawes, M.C. 1991. Living plant cells released from the root cap: A regulator of microbial populations in the rhizosphere? in The rhizosphere and plant growth, Keister, D.L., and Cregan, P.B., Eds. Dordrecht.
176. Hawes, M.C., Brigham, L.A., Wen, F., Woo, H.-H., and Zhu, Y. 1998. Function of root border cells: Pioneers in the rhizosphere. Annu. Rev. Phytopathol. 36, 311.
177. Hawes, M.C., Brigham, L.A., Woo, H.-H., Zhu, Y., and Wen, F. 1996. Root border cells in Biology of plant-microbe interactions. Proceedings of the 8th International Symposium on Molecular Plant-Microbe Interactions, Knoxville, Tennessee, 14-19 July 1996., Stacey, G., Mullin, B., and Gresshoff, P.M., Eds. St. Paul.
178. He, S.Y. 1998. Type III protein secretion systems in plant and animal pathogenic bacteria. Annu. Rev. Phytopathol. 36, 363.
179. He, X., Chang, W., Pierce, D.L., Seib, L.O., Wagner, J., and Fuqua, C. 2003. Quorum sensing in Rhizobium sp. strain NGR234 regulates conjugal transfer (tra) gene expression and influences growth rate. J. Bacteriol. 185, 809.
180. Heeb, S., and Haas, D. 2001. Regulatory roles of the GacS/GacA two-component system in plant-associated and other Gram-negative bacteria. Mol. Plant Microbe Interact. 14, 1351.
181. Heeb, S., Blumer, C., and Haas, D. 2002. Regulatory RNA as mediator in GacA/RsmA-dependent global control of exoproduct formation in Pseudomonas fluorescens CHA0. J. Bacteriol. 184, 1046.
182. Heinrich, D., and Hess, D. 1984. Chemotactic attraction of Azospirillum lipoferum by wheat roots and characterization of some attractants. Can. J. Microbiol. 31, 26.
183. Heinrich, K., Gordon, D.M., Ryder, M.H., and Murphy, P.J. 1999. A rhizopine strain of Sinorhizobium meliloti remains at a competitive nodulation advantage after an extended period in the soil. Soil Biol. Biochem. 31, 1063.
184. Henderson, I.R., Owen, P., and Nataro, J.P. 1999. Molecular switches-the ON and OFF of bacterial phase variation. Mol. Microbiol. 33, 919.
185. Heulin, T., Gucken, A., and Balandreau, J. 1987. Stimulation of root exudation of rice seedlings by Azospirillum strains: Carbon budget under gnotobiotic conditions. Biol. Fertil. Soils 4, 9.
186. Hirsch, A.M., Lum, M.R., and Downie, J.A. 2001. What makes the rhizobia-legume symbiosis so special? Plant Physiol. 127, 1484.
187. Hirsch, A.M. 1999. Role of lee tins (and rhizobial exopolysaccharides) in legume nodulation. Curr. Opin. Plant Biol. 2, 320.
188. Hirsch, P.R. 1979. Plasmid-determined bacteriocin production by Rhizobium leguminosarum. J. Gen. Microbiol. 113, 219.
189. Hogg, B., Davies, A.E., Wilson, K.E., Bisseling, T., and Downie, I.A. 2002. Competitive nodulation blocking of cv. Afghanistan pea is related to high levels of nodulation factors made by some strains of Rhizobium leguminosarum bv. viciae. Mol. Plant Microbe Interact. 15, 60.
190. Holden, M.T., Ram, C.S., de Nys, R., Stead, P., Bainton, N.J., Hill, P.J., Manefield, M., Kumar, N., Labatte, M., England, D., Rice, S., Givskov, M., Salmond, G.P., Stewart, G.S., Bycroft, B.W., Kjelleberg, S., and Williams, P. 1999. Quorum-sensing cross talk: Isolation and chemical characterization of cyclic dipeptides from Pseudomonas aeruginosa and other gram-negative bacteria. Mol. Microbiol. 33, 1254.
191. Holguin, G., Patten, C.L., and Glick, B.R. 1999. Genetics and molecular biology of Azospirillum. Biol. Fertil. Soils 29, 10.
192. Honma, M.A., Asomaning, M., and Ausubel, F.M. 1990. Rhizobium meliloti nodD genes mediate host-specific activation of nodABC. J. Bacteriol. 172, 901.
193. Hungria, M., and Stacey, G. 1997. Molecular signals exchanged between host plants and rhizobia: Basic aspects and potential application in agriculture. Soil Biol. Biochem. 29, 819.
194. Hurek, T., and Reinhold-Hurek, B. 2003. Azoarcus sp. strain BH72 as a model for nitrogen-fixing grass endophytes. J. Biotechnol. 106, 169.
195. Ignatov, V., Stadnik, G., Iosipenko, O., Selivanov, N., Iosipenko, A., and Sergeeva, E. 1995. Interactions between partners in the association "wheat-Azospirillum brasilense Sp245" in Azospirillum VI and related microorganisms: Genetics, physiology, ecology, Fendrik, I., Del Gallo, M., Vanderleyden, J., and de Zamaroczy, M., Eds. Berlin Heidelberg.
196. Jaeger, C.H.I., Lindow, S.E., Miller, W., Clark, E., and Firestone, M.K. 1999. Mapping of sugar and amino acid availability in soil around roots with bacterial sensors of sucrose and tryptophan. Appl. Environ. Microbiol. 65, 2685.
197. Jayaraman, V., and Das, H.R. 1998. Interaction of peanut root lectin (PRA II) with rhizobial lipopolysaccharides. Biochim. Biophys. Acta 1381, 7.
198. Jetiyanon, K., and Kloepper, J.W. 2002. Mixtures of plant growth-promoting rhizobacteria for induction of systemic resistance against multiple plant diseases. Biol. Control 24, 285.
199. Jimenez-Zurdo, J.I., Garcia-Rodriguez, F.M., and Toro, N. 1997. The Rhizobium meliloti putA gene: Its role in the establishment of the symbiotic interaction with alfalfa. Mol. Microbiol. 23, 85.
200. Jimenez-Zurdo, J.I., van Dillewijn, P., Soto, M.J., de Felipe, M.R., Olivares, J., and Toro, N. 1995. Characterization of a Rhizobium meliloti proline dehydrogenase mutant altered in nodulation efficiency and competitiveness on alfalfa roots. Mol. Plant Microbe Interact. 8, 492.
201. Jofré, E., Fischer, S., Rivarola, V., Balegno, H., and Mori, G. 1998. Saline stress affects the attachment of Azospirillum brasilense Cd to maize and wheat roots. Can. J. Microbiol. 44, 416.
202. Joyner, D.C., and Lindow, S.E. 2000. Heterogeneity of iron bioavailability on plants assessed with a whole-cell GFP-based bacterial biosensor. Microbiology 146, 2435.
203. Kadouri, D., Burdman, S., Jurkevitch, E., and Okon, Y. 2002. Identification and isolation of genes involved in poly(beta-hydroxybutyrate) biosynthesis in Azospirillum brasilense and characterization of a phbC mutant. Appl. Environ. Microbiol. 68, 2943.
204. Kadouri, D., Jurkevitch, E., and Okon, Y. 2003. Involvement of the reserve material poly-beta-hydroxybutyrate in Azospirillum brasilense stress endurance and root colonization. Appl. Environ. Microbiol. 69, 3244.
205. Karpati, E., Kiss, P., Afsharian, M., Marini, F., Buglioni, S., Fendrik, I., and Del Gallo, M. 1995. Molecular study of the interaction of Azospirillum lipoferum with wheat germ agglutinin in Azospirillum VI and related microorganisms: Genetics, physiology, ecology, Fendrik, I., Del Gallo, M., Vanderleyden, J., and de Zamaroczy, M., Eds. Heidelberg Berlin.
206. Karpati, E., Kiss, P., Ponyi, T., Fendrik, I., de Zamaroczy, M., and Orosz, L. 1999. Interaction of Azospirillum lipoferum with wheat germ agglutinin stimulates nitrogen fixation. J. Bacteriol. 181, 3949.
207. Kennedy, A.C. 1998. The rhizosphere and spermosphere in Principles and applications of soil microbiology, Sylvia, D.M., Fuhrmann, J.J., Hartel, P.G., and Zuberer, D.A., Eds. New Jersey.
208. Khammas, K.M., and Kaiser, P. 1991. Characterization of a pectinolytic activity in Azospirillum irakense. Plant Soil 137, 75.
209. Khammas, K.M., Ageron, E., Grimont, P.A., and Kaiser, P. 1989. Azospirillum irakense sp. nov., a nitrogen-fixing bacterium associated with rice roots and rhizosphere soil. Res. Microbiol. 140, 679.
210. Kijne, J.W., Smit, G., Diaz, C.L., and Lugtenberg, B.J. 1988. Lectin-enhanced accumulation of manganese-limited Rhizobium leguminosarum cells on pea root hair tips. J. Bacteriol. 170, 2994.
211. Kim, H., and Farrand, S.K. 1997. Characterization of the acc operon from the nopaline-type Ti plasmid pTiC58, which encodes utilization of agrocinopines A and B and susceptibility to agrocin 84, J. Bacteriol. 179, 7559.
212. Kim, H., and Farrand, S.K. 1998. Opine catabolic loci from Agrobacterium plasmids confer chemotaxis to their cognate substrates. Mol. Plant Microbe Interact. 11, 131.
213. Kim, Y.C., Miller, C.D., and Anderson, A.J. 2000. Superoxide dismutase activity in Pseudomonas putida affects utilization of sugars and growth on root surfaces. Appl. Environ. Microbiol. 66, 1460.
214. Kimmel, S., Reinhold-Hurek, B., Fendrik, I., and Niemann, E.-G. 1990. Contribution of chemotaxis and aerotaxis to the establishment of Azospirillum in the rhizosphere. Symbiosis 9, 195.
215. King, N.D., Hojnacki, D., and O'Brian, M.R. 2000. The Bradyrhizobium japonicum proline biosynthesis gene proC is essential for symbiosis. Appl. Environ. Microbiol. 66, 5469.
216. Kloepper, J.W., Zablotowicz, R.M., Tipping, E.M., and Lifshitz, R. 1991. Plant growth promotion mediated by bacterial rhizosphere colonizers in The rhizosphere and plant growth, Keister, D.L., and Cregan, P.B., Eds. Dordrecht.
217. Knee, E.M., Gong, F.C., Gao, M., Teplitski, M., Jones, A.R., Foxworthy, A., Mort, A.J., and Bauer, W.D. 2001. Root mucilage from pea and its utilization by rhizosphere bacteria as a sole carbon source. Mol. Plant Microbe Interact. 14, 775.
218. Koch, B., Nielsen, T.H., Sorensen, D., Andersen, J.B., Christophersen, C., Molin, S., Givskov, M., Sorensen, J., and Nybroe, O. 2002. Lipopeptide production in Pseudomonas sp. strain DSS73 is regulated by components of sugar beet seed exudate via the Gac two-component regulatory system. Appl. Environ. Microbiol. 68, 4509.
219. Koch, B., Worm, J., Jensen, L.E., Hojberg, O., and Nybroe, O. 2001. Carbon limitation induces sigma(S)-dependent gene expression in Pseudomonas fluorescens in soil. Appl. Environ. Microbiol. 67, 3363.
220. Kohler, S., Belkin, S., and Schmid, R.D. 2000. Reporter gene bioassays in environmental analysis. Fresenius. J. Anal. Chem. 366, 769.
221. Kowalchuk, G.A., Buma, D.S., de Boer, W., Klinkhamer, P.G., and van Veen, J.A. 2002. Effects of above-ground plant species composition and diversity on the diversity of soil-borne microorganisms. Antonie Van Leeuwenhoek 81, 509.
222. Kraffczyk, I., Trolldenier, G., and Beringer, H. 1984. Soluble root exudates of maize: Influence of potassium supply and rhizosphere microorganisms. Soil Biol. Biochem. 16, 315.
223. Kragelund, L., and Nybroe, O. 1996. Competition between Pseudomonas fluorescens Ag1 and Alcaligenes eutrophus JMP134 (pJP4) during colonization of barley roots. FEMS Microbiol. Ecol. 20, 41.
224. Kragelund, L., Hosbond, C., and Nybroe, O. 1997. Distribution of metabolic activity and phosphate starvation response of lux-tagged Pseudomonas fluorescens reporter bacteria in the barley rhizosphere. Appl. Environ. Microbiol. 63, 4920.
225. Kuiper, I., Bloemberg, G.V., and Lugtenberg, B.J. 2001. Selection of a plant-bacterium pair as a novel tool for rhizostimulation of polycyclic aromatic hydrocarbon-degrading bacteria. Mol. Plant Microbe Interact. 14, 1197.
226. Kuiper, I., Bloemberg, G.V., Noreen, S., Thomas-Oates, J.E., and Lugtenberg, B.J. 2001. Increased uptake of putrescine in the rhizosphere inhibits competitive root colonization by Pseudomonas fluorescens strain WCS365. Mol. Plant Microbe Interact. 14, 1096.
227. Kuiper, I., Kravchenko, L.V., Bloemberg, G.V., and Lugtenberg, B.J. 2002. Pseudomonas putida strain PCL1444, selected for efficient root colonization and naphthalene degradation, effectively utilizes root exudate components. Mol. Plant Microbe Interact. 15, 734.
228. Kuzyakov, Y. 2002. Review: Factors affecting rhizosphere priming effects. J. Plant Nutr. Soil Sci. 165, 382.
229. Laeremans, T., and Vanderleyden, J. 1998. Review: Infection and nodulation signalling in Rhizobium-Phaseolus vulgaris symbiosis. World J. Microbiol. Biotechnol. 14, 787.
230. Lam, S.T., Ellis, D.M., and Ligon, J.M. 1991. Genetic approaches for studying rhizosphere colonization in The rhizosphere and plant growth, Keister, D.L., and Cregan, P.B., Eds. Dordrecht.
231. Lambrecht, M., Okon, Y., Vande Broek, A., and Vanderleyden, J. 2000. Indole-3-acetic acid: A reciprocal signalling molecule in bacteria-plant interactions. Trends Microbiol. 8, 298.
232. Lambrecht, M. 1999. Rhizosphere signalling molecules altering gene expression in Azospirillum brasilense: Indole-3-acetic acid and sugars, PhD Dissertation K.U. Leuven, Belgium.
233. Lamont, I.L., Beare, P.A., Ochsner, U., Vasil, A.I., and Vasil, M.L. 2002. Siderophore-mediated signalling regulates virulence factor production in Pseudomonas aeruginosa. Proc. Natl. Acad. Sci. U.S.A. 99, 7072.
234. Langlois, P., Bourassa, S., Poirier, G.G., and Beaulieu, C. 2003. Identification of Streptomyces coelicolor proteins that are differentially expressed in the presence of plant material. Appl. Environ. Microbiol. 69, 1884.
235. Laue, B.E., Jiang, Y., Chhabra, S.R., Jacob, S., Stewart, G.S., Hardman, A., Downie, J.A., O'Gara, F., and Williams, P. 2000. The biocontrol strain Pseudomonas fluorescens F113 produces the Rhizobium small bacteriocin, N-(3-hydroxy-7-cis-tetradecenoyl)homoserine lactone, via HdtS, a putative novel N-acylhomoserine lactone synthase. Microbiology 146, 2469.
236. Leadbetter, J.R., and Greenberg, E.P. 2000. Metabolism of acyl-homoserine lactone quorum-sensing signals by Variovorax paradoxus. J. Bacteriol. 182, 6921.
237. Lee, S.J., Park, S.Y., Lee, J.J., Yum, D.Y., Koo, B.T., and Lee, J.K. 2002. Genes encoding the N-acyl homoserine lactone-degrading enzyme are widespread in many subspecies of Bacillus thuringiensis. Appl. Environ. Microbiol. 68, 3919.
238. Lenski, R.E., Mongold, J.A., Sniegowski, P.D., Travisano, M., Vasi, F., Gerrish, P.J., and Schmidt, T.M. 1998. Evolution of competitive fitness in experimental populations of E. coli: What makes one genotype a better competitor than another? Antonie Van Leeuwenhoek 73, 35.
239. Lin, Y.H., Xu, J.L., Hu, J., Wang, L.H., Ong, S.L., Leadbetter, J.R., and Zhang, L.H. 2003. Acyl-homoserine lactone acylase from Ralstonia strain XJ12B represents a novel and potent class of quorum-quenching enzymes. Mol. Microbiol. 47, 849.
240. Lindow, S.E. 1996. Molecular genetic approaches to assessing bacterial habitat composition, modification, and interactions on leaves in Biology of plant-microbe interactions: Proceedings of the 8th International Symposium on Molecular Plant-Microbe Interactions Knoxville, Tennessee, 14-19 July 1996, Stacey, G., Mullin, B., and Gresshoff, P.M., Eds. St. Paul.
241. Lithgow, J.K., Wilkinson, A., Hardman, A., Rodelas, B., Wisniewski-Dye, F., Williams, P., and Downie, J.A. 2000. The regulatory locus cinR1 in Rhizobium leguminosarum controls a network of quorum-sensing loci. Mol. Microbiol. 37, 81.
242. Lodeiro, A.R., and Favelukes, G. 1999. Early interactions of Bradyrhizobium japonicum and soybean roots: Specificity in the process of adsorption. Soil Biol. Biochem. 31, 1405.
243. 2+ ions., Appl. Environ. Microbiol. 61, 1571.
244. Lodeiro, A.R., Lopez-Garcia, S.L., Vazquez, T.E., and Favelukes, G. 2000. Stimulation of adhesiveness, infectivity, and competitiveness for nodulation of Bradyrhizobium japonicum by its pretreatment with soybean seed lectin. FEMS Microbiol. Lett. 188, 177.
245. Loh, J., and Stacey, G. 2003. Nodulation gene regulation in Bradyrhizobium japonicum: A unique integration of global regulatory circuits. Appl. Environ. Microbiol. 69, 10.
246. Loh, J.T., Yuen-Tsai, J.P., Stacey, M.G., Lohar, D., Welborn, A., and Stacey, G. 2001. Population density-dependent regulation of the Bradyrhizobium japonicum nodulation genes. Mol. Microbiol. 42, 37.
247. Loh, J., Carlson, R.W., York, W.S., and Stacey, G. 2002. Bradyoxetin, a unique chemical signal involved in symbiotic gene regulation. Proc. Natl. Acad. Sci. USA 99, 14446.
248. Loh, J., Garcia, M., and Stacey, G. 1997. NodV and NodW, a second flavonoid recognition system regulating nod gene expression in Bradyrhizobium japonicum. J. Bacteriol. 179, 3013.
249. Loh, J., Garcia, M., Yuen, J., and Stacey, G. 1996. nod gene regulation in Bradyrhizobium japonicum in Biology of plant microbe interactions: Proceedings of the 8th International Symposium on Molecular Plant-Microbe Interactions Knoxville, Tennessee, 14-19 July 1996, Stacey, G., Mullin, B., and Gresshoff, P.M., Eds. St. Paul.
250. Loh, J., Lohar, D.P., Andersen, B., and Stacey, G. 2002. A two-component regulator mediates population-density-dependent expression of the Bradyrhizobium japonicum nodulation genes. J. Bacteriol. 184, 1759.
251. Lohrke, S.M., Dery, P.D., Li, W., Reedy, R., Kobayashi, D.Y., and Roberts, D.R. 2002. Mutation of rpiA in Enterobacter cloacae decreases seed and root colonization and biocontrol of damping-off caused by Pythium ultimum on cucumber. Mol. Plant Microbe Interact. 15, 817.
252. Loper, J.E., and Buyer, J.S. 1991. Siderophores in microbial interactions on plant surfaces. Mol. Plant Microbe Interact. 14, 5.
253. Loper, J.E., and Henkels, M.D. 1997. Availability of iron to Pseudomonas fluorescens in rhizosphere and bulk soil evaluated with an ice nucleation reporter gene. Appl. Environ. Microbiol. 63, 99.
254. Loper, J.E., and Henkels, M.D. 1999. Utilization of heterologous siderophores enhances levels of iron available to Pseudomonas putida in the rhizosphere. Appl. Environ. Microbiol. 65, 5357.
255. Lopez-de-Victoria, G., and Lovell, C.R. 1993. Chemotaxis of Azospirillum species to aromatic compounds. Appl. Environ. Microbiol. 59, 2951.
256. Lugtenberg, B.J., and Dekkers, L.C. 1999. What makes Pseudomonas bacteria rhizosphere competent? Environ. Microbiol. 1, 9.
257. Lugtenberg, B.J.J., Dekkers, L., and Bloemberg, G.V. 2001. Molecular determinants of rhizosphere colonization by Pseudomonas. Annu. Rev. Phytopathol. 39, 461.
258. Lugtenberg, B.J., Chin, A.W.T., and Bloemberg, G.V. 2002. Microbe-plant interactions: Principles and mechanisms. Antonie Van Leeuwenhoek 81, 373.
259. Lugtenberg, B.J., Kravchenko, L.V., and Simons, M. 1999. Tomato seed and root exudate sugars: Composition, utilization by Pseudomonas biocontrol strains and role in rhizosphere colonization. Environ. Microbiol. 1, 439.
260. Lugtenberg, B., van der Bij, A., Bloemberg, G., Chin, A.W.T., Dekkers, L., Kravchenko, L., Mulders, I., Phoelich, C., Simons, M., Spaink, H., Tikhonovich, I., de Weger, L., and Wijffelman, C. 1996. Molecular basis of rhizosphere colonization by Pseudomonas bacteria in Biology of plant-microbe interactions. Proceedings of the 8th International Symposium on Molecular Plant-Microbe Interactions, Knoxville, Tennessee, 14-19 July 1996., Stacey, G., Mullin, B., and Gresshoff, P.M., Eds. St. Paul.
261. Luyten, E., and Vanderleyden, J. 2000. Survey of genes identified in Sinorhizobium meliloti spp., necessary for the development of an efficient symbiosis. Eur. J. Soil Biol. 36, 1.
262. Lynch, J.M., and Whipps, J.M. 1990. Substrate flow in the rhizosphere. Plant Soil 129, 1.
263. Maccio, D., Fabra, A., and Castro, S. 2002. Acidity and calcium interaction affect the growth of Bradyrhizobium sp., and the attachment to peanut roots. Soil Biol. Biochem. 34, 201.
264. Magalhães, F.M., Baldani, J.I., Souto, S.M., Döbereiner, J., and Döbereiner, J. 1984. A new acid-tolerant Azospirillum species. An. Acad. Brasil. Cienc. 55, 417.
265. Mandimba, G., Heulin, T., Bally, R., Guckert, A., and Balandreau, J. 1986. Chemotaxis of free-living nitrogen-fixing bacteria towards maize mucilage. Plant Soil 90, 129.
266. Manefield, M., de Nys, R., Kumar, N., Read, R., Givskov, M., Steinberg, P., and Kjelleberg, S. 1999. Evidence that halogenated furanones from Delisea pulchra inhibit acylated homoserine lactone (AHL)-mediated gene expression by displacing the AHL signal from its receptor protein. Microbiology 145, 283.
267. Manefield, M., Rasmussen, T.B., Henzter, M., Andersen, J.B., Steinberg, P., Kjelleberg, S., and Givskov, M. 2002. Halogenated furanones inhibit quorum sensing through accelerated LuxR turnover. Microbiology 148, 1119.
268. Manefield, M., Welch, M., Givskov, M., Salmond, G.P., and Kjelleberg, S. 2001. Halogenated furanones from the red alga, Deliseapulchra, inhibit carbapenem antibiotic synthesis and exoenzyme virulence factor production in the phytopathogen Erwinia carotovora. FEMS Microbiol. Lett. 205, 131.
269. Mansouri, H., Petit, A., Oger, P., and Dessaux, Y. 2002. Engineered rhizosphere: The trophic bias generated by opine-producing plants is independent of the opine type, the soil origin, and the plant species. Appl. Environ. Microbiol. 68, 2562.
270. 2-paradox of Azospirillum. Biol. Fertil. Soils 30, 363,
271. Marie, C., Broughton, W.J., and Deakin, W.J. 2001. Rhizobium type III secretion systems: Legume charmers or alarmers? Curr. Opin. Plant Biol. 4, 336.
272. Marini, F., Speranza, S., and Del Gallo, M. 1995. Influence of the carbon substrate on the composition of the exocellular polysaccharides by Azospirillum brasilense in Azospirillum VI and related microorganisms: Genetics, physiology, ecology, Fendrik, I., Del Gallo, M., Vanderleyden, J., and de Zamaroczy, M., Eds. Berlin Heidelberg.
273. Marketon, M.M., Glenn, S.A., Eberhard, A., and Gonzalez, J.E. 2003. Quorum sensing controls exopolysaccharide production in Sinorhizobium meliloti. J. Bacteriol. 185, 325.
274. Mathesius, U., Mulders, S., Gao, M., Teplitski, M., Caetano-Anolles, G., Rolfe, B.G., and Bauer, W.D. 2003. Extensive and specific responses of a eukaryote to bacterial quorum-sensing signals. Proc. Natl. Acad. Sci. USA 100, 1444.
275. Matora, L.Y., Serebrennikova, O.B., and Shchyogolev, S.Y. 2001. Structural effects of the Azospirillum lipopolysaccharides in cell suspensions. Biomacromolecules 2, 402.
276. Matora, L., Solovova, G., Serebrennikova, O., and Selivanov, N. 1995. Immunological properties of Azospirillum cell surface: The structure of carbohydrate antigens and evaluation of their involvement in bacteria-plant contact interactions in Azospirillum VI and related organisms: Genetics, physiology, ecology, Fendrik, I., Del Gallo, M., Vanderleyden, J., and de Zamaroczy, M., Eds. Berlin Heidelberg.
277. Matthysse, A.G., and McMahan, S. 1998. Root colonization by Agrobacterium tumefaciens is reduced in cel, attB, attD, and attR mutants, Appl. Environ. Microbiol. 64, 2341.
278. Matthysse, A.G., and McMahan, S. 2001. The effect of the Agrobacterium tumefaciens attR mutation on attachment and root colonization differs between legumes and other dicots. Appl. Environ. Microbiol. 67, 1070.
279. Matthysse, A.G. 1983. Role of bacterial cellulose fibrils in Agrobacterium tumefaciens infection. J. Bacteriol. 154, 906.
280. Matthysse, A.G., Yarnall, H.A., and Young, N. 1996. Requirement for genes with homology to ABC transport systems for attachment and virulence of Agrobacterium tumefaciens. J. Bacteriol. 178, 5302.
281. Mazzola, M., and White, F.F. 1994. A mutation in the indole-3-acetic acid biosynthesis pathway of Pseudomonas syringae pv. syringae affects growth in Phaseolus vulgaris and syringomycin production. J. Bacteriol. 176, 1374.
282. Mazzola, M., Cook, R.J., Thomashow, L.S., Weller, D.M., and Pierson, L.S., III. 1992. Contribution of phenazine antibiotic biosynthesis to the ecological competence of fluorescent pseudomonads in soil habitats. Appl. Environ. Microbiol. 58, 2616.
283. McBride, M.J. 2001. Bacterial gliding motility: Multiple mechanisms for cell movement over surfaces. Annu. Rev. Microbiol. 55, 49.
284. McClure, N.C., Ahmadi, A.R., and Clare, E.G. 1998. Construction of a range of derivatives of the biological control strain Agrobacterium rhizogenes K84: A study of factors involved in biological control of crown gall disease. Appl. Environ. Microbiol. 64, 3977.
285. Michiels, K., Croes, C.L., and Vanderleyden, J. 1991. Two different modes of attachment of Azospirillum brasilense Sp7 to wheat roots. J. Gen. Microbiol. 137, 2241,
286. Michiels, K., Vanderleyden, J., and Elmerich, C. 1994. Genetics and molecular biology of Azospirillum in Azospirillum/plant associations, Okon, Y., Ed. Boca Raton, Florida.
287. Michiels, K., Vanderleyden, J., and Van Gool A. 1989. Azospirillum-plant root associations: A review. Biol. Fertil. Soils 8, 356.
288. Miller, C.D., Kim, YC., and Anderson, A.J. 1997. Cloning and mutational analysis of the gene for the stationary-phase inducible catalase (catC) from Pseudomonas putida. J. Bacteriol. 179, 5241.
289. Miller, K.J., and Wood, J.M. 1996. Osmoadaptation by rhizosphere bacteria. Annu. Rev. Microbiol. 50, 101.
290. Miller, W.G., Brandi, M.T., Quinones, B., and Lindow, S.E. 2001. Biological sensor for sucrose availability: Relative sensitivities of various reporter genes. Appl. Environ. Microbiol. 67, 1308.
291. Milner, J.L., Silo-Suh, L., Lee, J.C., He, H., Clardy, J., and Handelsman, J. 1996. Production of kanosamine by Bacillus cereus UW85. Appl. Environ. Microbiol. 62,3061.
292. Milner, J.L., Stohl, E.A., and Handelsman, J. 1996. Zwittermicin A resistance gene from Bacillus cereus. J. Bacteriol. 178, 4266.
293. Minic, Z., Brown, S., De Kouchkovsky, Y., Schultze, M., and Staehelin, C. 1998. Purification and characterization of a novel chitinase-lysozyme, of another chitinase, both hydrolysing Rhizobium meliloti Nod factors, and of a pathogenesis-related protein from Medicago sativa roots. Biochem. J. 332, 329.
294. Mirleau, P., Delorme, S., Philippot, L., Meyer, J., Mazurier, S., and Lemanceau, P. 2000. Fitness in soil and rhizosphere of Pseudomonas fluorescens C7R12 compared with a C7R12 mutant affected in pyoverdine synthesis and uptake. FEMS Microbiol. Ecol. 34, 35.
295. Mirleau, P., Philippot, L., Corberand, T., and Lemanceau, P. 2001. Involvement of nitrate reductase and pyoverdine in competitiveness of Pseudomonas fluorescens strain C7R12 in soil. Appl. Environ. Microbiol. 67, 2627.
296. Mithofer, A. 2002. Suppression of plant defence in rhizobia-legume symbiosis. Trends Plant Sci. 7, 440.
297. Moënne-Loccoz, Y., McHugh, B., Stephens, P.M., Glennon, J.D., Dowling, D., and O'Gara, F. 1996. Rhizosphere competance of fluorescent Pseudomonas sp. B24 genetically modified to utilise additional ferric siderophores. FEMS Microbiol. Ecol. 19, 215.
298. Moens, S., Michiels, K., Keijers, V., Van Leuven, F., and Vanderleyden, J. 1995. Cloning, sequencing, and phenotypic analysis of laf1, encoding the flagellin of the lateral flagella of Azospirillum brasilense Sp7. J. Bacteriol. 177, 5419.
299. Molina, L., Constantinescu, F., Michel, L., Reimmann, C., Duffy, B., and Defago, G. 2003. Degradation of pathogen quorum-sensing molecules by soil bacteria: A preventive and curative biological control mechanism. FEMS Microbiol. Ecol. 45, 71.
300. Mori Mudgett, M.B., and Staskawicz, B.J. 1998. Protein signalling via type III secretion pathways in phytopathogenic bacteria. Curr. Opin. Microbiol. 1, 109.
301. Murphy, P.J., Wexler, W., Grzemski, W., Rao, J.P., and Gordon, D. 1995. Rhizopines: Their role in symbiosis and competition. Soil Biol. Blochem. 27, 525.
302. Naeem, A., Khan, R.H., Vikram, H., and Akif, M. 2001. Purification of Cajanus cajan root lectin and its interaction with rhizobial lipopolysaccharide as studied by different spectroscopic techniques. Arch. Biochem. Biophys. 396, 99.
303. Niehaus, K., Baier, R., Becker, A., and Pühler, A. 1996. Symbiotic suppression of the Medicago sativa defense system-the key of Rhizobium meliloti to enter the host plant in Biology of plant microbe interactions: Proceedings of the 8th International Symposium on Molecular Plant-Microbe Interactions Knoxville, Tennessee, 14-19 July 1996, Stacey, G., Mullin, B., and Gresshoff, P.M., Eds. St. Paul.
304. Noel, K.D., Duelli, D.M., and Neumann, V.R. 1996. Rhizobium etli lipopolysaccharide alterations triggered by host exudate compounds in Biology of plant microbe interactions: Proceedings of the 8th International Symposium on Molecular Plant-Microbe Interactions Knoxville, Tennessee, 14-19 July 1996, Stacey, G., Mullin, B., and Gresshoff, P.M., Eds. St. Paul.
305. Normander, B., Hendriksen, N.B., and Nybroe, O. 1999. Green fluorescent protein-marked Pseudomonas fluorescens'. Localization, viability, and activity in the natural barley rhizosphere. Appl. Environ. Microbiol. 65, 4646.
306. Notz, R., Maurhofer, M., Dubach, H., Haas, D., and Defago, G. 2002. Fusaric acid-producing strains of Fusarium oxysporum alter 2,4- diacetylphloroglucinol biosynthetic gene expression in Pseudomonas fluorescens CHAO in vitro and in the rhizosphere of wheat. Appl. Environ. Microbiol 68, 2229.
307. O'Connell, K.P., Goodman, R.M., and Handelsman, J. 1996. Engineering the rhizosphere: Expressing a bias. Trends Biotechnol. 14, 83.
308. Oger, P., Petit, A., and Dessaux, Y. 1997. Genetically engineered plants producing opines alter their biological environment. Nat. Biotechnol. 15, 369.
309. Oke, V., and Long, S.R. 1999. Bacterial genes induced within the nodule during the Rhizobium-legume symbiosis. Mol. Microbiol. 32, 837.
310. Okon, Y., and Itzigsohn, R. 1995. The development of Azospirillum as a commercial inoculant for improving crop yields. Biotech. Adv. 13, 415.
311. Okon, Y., and Kapulnik, Y. 1986. Development and function of Azospirillum-inoculated roots. Plant Soil 90, 3.
312. Okon, Y., and Vanderleyden, J. 1997. Root-associated Azospirillum species can stimulate plants. ASM News 63, 366.
313. Okon, Y. 1994. Azospirillum/plant associations, CRC Press, Boca Raton.
314. Oliveira, R.G.B., and Drozdowicz, A. 1988. Are Azospirillum bacteriocins produced and active in soil? in Azospirillum IV: Genetics, physiology, ecology, Klingmüller, W., Ed. Berlin Heidelberg.
315. Oresnik, I.J., Pacarynuk, L.A., O'Brien, S.A.P., Yost, C.K., and Hynes, M.F. 1998. Plasmid-encoded catabolic genes in Rhizobium leguminosarum bv. trifolii: Evidence for a plant-Inducible rhamnose locus involved in competition for nodulation. Mol. Plant Microbe Interact. 11, 1175.
316. Oresnik, I.J., Twelker, S., and Hynes, M.F. 1999. Cloning and characterization of a Rhizobium leguminosarum gene encoding a bacteriocin with similarities to RTX toxins. Appl. Environ. Microbiol. 65, 2833.
317. O'toole, G.A., and Kolter, R. 1998. Flagellar and twitching motility are necessary for Pseudomonas aeruginosa biofilm development. Mol. Microbiol. 30, 295.
318. Ovtsyna, A.O., Schultze, M., Tikhonovich, I.A., Spaink, H.P., Kondorosi, E., Kondorosi, A., and Staehelin, C. 2000. Nod factors of Rhizobium leguminosarum bv. viciae and their fucosylated derivatives stimulate a Nod factor cleaving activity in pea roots but are hydrolyzed in vitro by plant chitinases at different rates. Mol. Plant Microbe Interact. 13, 799.
319. Parke, J.L. 1991. Root colonization by indigenous and introduced microorganisms in The rhizosphere and plant growth, Keister, D.L., and Cregan, P.B., Eds. Dordrecht.
320. Parret, A.H., and De Mot, R. 2002. Bacteria killing their own kind: Novel bacteriocins of Pseudomonas and other gamma-proteobacteria. Trends Microbiol. 10, 107.
321. Parret, A.H., and De Mot, R. 2000. Bacteriocin production by rhizosphere-colonizing fluorescent Pseudomonas in Proceedings of the fifth International PGPR Workshop, Auburn University Web Site (http://www.ag.aubum. edu/argentina/pdfmanuscripts/parret.pdf).
322. Parret, A.H., Schoofs, G., Proost, P., and De Mot, R. 2003. Plant lectin-like bacteriocin from a rhizosphere-colonizing Pseudomonas isolate. J. Bacteriol. 185, 897.
323. Pastorelli, R., Gori, A., and Favilli, F. 1995. Adhesion of rhizosphere bacteria to roots of maize and wheat in Azospirillum VI and related microorganisms: Genetics, physiology, ecology, Fendrik, I., Del Gallo, M., Vanderleyden, J., and de Zamaroczy, M., Eds. Berlin Heidelberg.
324. Pellock, B.J., Cheng, H.P., and Walker, G.C. 2000. Alfalfa root nodule invasion efficiency is dependent on Sinorhizobium meliloti polysaccharides. J. Bacteriol. 182, 4310.
325. Peng, W.T., Lee, Y. W., and Nester, E.W. 1998. The phenolic recognition profiles of the Agrobacterium lumefaciens VirA protein are broadened by a high level of the sugar binding protein ChvE. J. Bacteriol. 180, 5632.
326. Pereg-Gerk, L., Paquelin, A., Gounon, P., Kennedy, I.R., and Elmerich, C. 1998. A transcriptional regulator of the LuxR-UhpA family, FlcA, controls flocculation and wheat root surface colonization by Azospirillum brasilense Sp7. Mol. Plant Microbe Interact. 11, 177.
327. Perret, X., Staehelin, C., and Broughton, W.J. 2000. Molecular basis of symbiotic promiscuity. Microbiol. Mol. Biol. Rev. 64, 180.
328. Persello-Cartieaux, F., Nussaume, L., and Robaglia, C. 2003. Tales from the underground: Molecular plant-rhizobacteria interactions. Plant Cell Environ. 26, 189.
329. Pesci, E.G., Milbank, J.B., Pearson, J.P., McKnight, S., Rende, A.S., Greenberg, E.P., and Iglewski, B.H. 1999. Quinolone signalling in the cell-to-cell communication system of Pseudomonas aeruginosa. Proc. Natl. Acad. Sci. USA 96, 11229.
330. Peters, N.K., Frost, J.W., and Long, S.R. 1986. A plant flavone, luteolin, induces expression of Rhizobium meliloti nodulation genes. Science 233, 977.
331. Philippot, L., Clays-Josserand, A., and Lensi, R. 1995. Use of Tn5 mutants to assess the role of the dissimilatory nitrite reductase in the competitive abilities of two Pseudomonas strains in soil. Appl. Environ. Microbiol. 61, 1426.
332. Phillips, D.A., and Streit, W.R. 1998. Modifying rhizosphere microbial communities to enhance nutrient availability in cropping systems. Field Crop. Res. 56, 217.
333. Phillips, D.A., Joseph, C.M., and Maxwell, C.A. 1992. Trigonelline and stachydrine released from alfalfa seeds activate nodD2 protein in Rhizobium meliloti. Plant Physiol. 99, 1526.
334. Phillips, D.A., Joseph, C.M., Yang, G.P., Martinez-Romero, E., Sanborn, J.R., and Volpin, H. 1999. Identification of lumichrome as a Sinorhizobium enhancer of alfalfa root respiration and shoot growth. Proc. Natl. Acad. Sci. USA 96, 12275.
335. Phillips, D.A., Maxwell, C.A., Hartwig, U.A., Joseph, C.M., and Wery, J. 1991. Rhizosphere flavonoids released by alfalfa in The rhizosphere and plant growth, Keister, D.L., and Cregan, P.B., Eds. Dordrecht.
336. Phillips, D.A., Sande, E.S., Vriezen, J.A.C., de Bruijn, F.J., Le Rudulier, D., and Joseph, C.M. 1998. A new genetic locus in Sinorhizobium meliloti is involved in stachydrine utilization. Appl. Environ. Microbiol. 64, 3954.
337. Pierson, L.S.I., Keppenne, V.D., and Wood, D.W. 1994. Phenazine antibiotic biosynthesis in Pseudomonas aureofaciens 30-84 is regulated by PhzR in response to cell density. J. Bacteriol. 176, 3966.
338. Pierson, L.S.I., Wood, D.W., and Pierson, E.A. 1998. Homoserine lactone-mediated gene regulation in plant-associated bacteria. Annu. Rev. Phytopathol. 36, 207.
339. Poole, K., and McKay, G.A. Iron acquisition and its control in Pseudomonas aeruginosa: Many roads lead to Rome. Front. Biosci. 8, 661, 2003.
340. Poplawsky, A.R., and Chun, W. 1998. Xanthomonas campestris pv. campestris requires a functional pigB for epiphytic survival and host infection. Mol. Plant Microbe Interact. 11,466.
341. Porteous, F., Killham, K., and Meharg, A. 2000. Use of a lux-marked rhizobacterium as a biosensor to assess changes in rhizosphere C flow due to pollutant stress. Chemosphere 41, 1549.
342. Preston, G.M., Bertrand, N., and Rainey, P.B. 2001. Type III secretion in plant growth-promoting Pseudomonas fluorescens SBW25. Mol. Microbiol. 41, 999.
343. Prikryl, Z., and Vancura, V. 1980. Root exudates of plants VI. Wheat root exudation as dependent on growth, concentration gradient of exudates and the presence of bacteria. Plant Soil 57, 69.
344. Raaijmakers, J.M., Van der Sluis, I., Koster, M., Bakker, P.A.H.M., Weisbeek, P.J., and Schippers, B. 1995. Utilization of heterologous siderophores and rhizosphere competence of fluorescent Pseudomonas spp. Can. J. Microbiol. 41, 126.
345. Raina, S., Raina, R., Venkatesh, T.V, and Das, H.K. 1995. Isolation and characterization of a locus from Azospirillum brasilense Sp7 that complements the tumorigenic defect of Agrobacterium lumefaciens chvB mutant. Mol. Plant Microbe Interact. 8, 322.
346. Rainey, P.B., and Preston, G.M. 2000. In vivo expression technology strategies: Valuable tools for biotechnology. Curr. Opin. Biotechnol. 11, 440.
347. Rainey, P.B. 1999. Adaptation of Pseudomonas fluorescens to the plant rhizosphere. Environ. Microbiol. 1, 243.
348. Ramamoorthy, R., Viswanathan, R., Raguchander, T., Prakasam, V, and Samiyappan, R. 2001. Induction of systemic resistance by plant growth promoting rhizobacteria in crop plants agai nst pests and diseases. Crop Protection 20, 1.
349. Ramos, C., Molbak, L., and Molin, S. 2000. Bacterial activity in the rhizosphere analyzed at the single-cell level by monitoring ribosome contents and synthesis rates. Appl. Environ. Microbiol. 66, 801.
350. Ramos, H.J., Roncato-Maccari, L.D., Souza, E.M., Soares-Ramos, J.R., Hungria, M., and Pedrosa, F.O. 2002. Monitoring Azospirillum-wheat interactions using the gfp and gusA genes constitutively expressed from a new broad-host range vector. J. Biotechnol. 97, 243.
351. Rao, J.R., and Cooper, I.E. 1994. Rhizobia catabolize nod gene-inducing flavonoids via C-ring fission mechanisms. J. Bacteriol. 176, 5409.
352. Rattray, E.A., Presser, J.I., Glover, L.A., and Killham, K. 1995. Characterization of rhizosphere colonization by luminescent Enterobacter cloacae at the population and single-cell levels. Appl. Environ. Microbiol. 61, 2950.
353. Rediers, H., Bonnecarrere, V., Rainey, P.B., Hamonts, K., Vanderleyden, J., and De Mot, R. 2003. Development and application of a dapB-based in vivo expression technology system to study colonization of rice by the endophytic nitrogen-fixing bacterium Pseudomonas stutzeri A15. Appl. Environ. Microbiol. 69, 6864.
354. Reinhold, B., Hurek, T., and Fendrik, I. 1985. Strain-specific chemotaxis of Azospirillum spp. J. Bacteriol. 162, 190.
355. Reinhold, B., Hurek, T., Fendrik, I., Pot, B., Gillis, M., Kesters, K., Thielemans, S., and De Ley, J. 1987. Azospirillum halopraeferens sp. nov., a nitrogen-fixing organism associated with roots of Kallar grass (Leptochloa fusca (L.) Kunth). Int. J. Syst. Bacteriol. 37, 43.
356. Reuhs, B.L. 1996. Acidic capsularpolysaccharides (K antigens) of Rhizobium in Biology of plant microbe interactions: Proceedings of the 8th International Symposium on Molecular Plant-Microbe Interactions Knoxville, Tennessee, 14-19 July 1996, Stacey, G., Mullin, B., and Gresshoff, P.M., Eds. St. Paul.
357. Reuhs, B.L., Carlson, R.W., and Kim, J.S. 1993. Rhizobium fredii and Rhizobium meliloti produce 3-deoxy-D-manno-2-octulosonic acid-containing polysaccharides that are structurally analogous to group II K antigens (capsular polysaccharides) found in Escherichia coli. J. Bacteriol. 175, 3570.
358. Reuhs, B.L., Geller, D.P., Kim, J.S., Fox, J.E., Kolli, VS., and Pueppke, S.G. 1998. Sinorhizobium fredii and Sinorhizobium meliloti produce structurally conserved lipopolysaccharides and strain-specific K antigens. Appl. Environ. Microbiol. 64, 4930.
359. Reuhs, B.L., Kim, J.S., and Matthysse, A.G. 1997. Attachment of Agrobacterium lumefaciens to carrot cells and Arabidopsis wound sites is correlated with the presence of a cell-associated, acidic polysaccharide. J. Bacteriol. 179, 5372.
360. Reuhs, B.L., Kim, J.S., Badgett, A., and Carlson, R.W. 1994. Production of cell-associated polysaccharides of Rhizobium fredii USDA205 is modulated by apigenin and host root extract. Mol. Plant Microbe Interact. 7, 240.
361. Reuhs, B.L., Williams, M.N., Kim, J.S., Carlson, R.W., and Cote, F. 1995. Suppression of the Fix-phenotype of Rhizobium meliloti exoB mutants by lpsZ is correlated to a modified expression of the K polysaccharide. J. Bacteriol. 177, 4289.
362. Rich, J.J., Kinscherf, T.G., Kitten, T., and Willis, D.K. 1994. Genetic evidence that the gacA gene encodes the cognate response regulator forthe lemA sensor in Pseudomonas syringae. J. Bacteriol. 176, 7468.
363. Riley, M.A., and Wertz, J.E. 2002. Bacteriocins: Evolution, ecology, and application. Annu. Rev. Microbiol. 56, 117.
364. Roberts, D.P., Dery, P.D., Yucel, I., and Buyer, J.S. 2000. Importance of pfkA for rapid growth of Enterobacter cloacae during colonization of crop seeds. Appl. Environ. Microbiol. 66, 87.
365. Roberts, D.P., Dery, P.D., Yucel, I., Buyer, J., Holtman, M.A., and Kobayashi, D. Y. 1999. Role of pfkA and general carbohydrate catabolism in seed colonization by Enterobacter cloacae. Appl. Environ. Microbiol. 65, 2513.
366. Roberts, I.S. 1996. The biochemistry and genetics of capsular polysaccharide production in bacteria. Annu. Rev. Microbiol. 50, 285.
367. Robleto, E.A., Borneman, J., and Triplett, E.W. 1998. Effects of bacterial antibiotic production on rhizosphere microbial communities from a culture-independent perspective. Appl. Environ. Microbiol. 64, 5020.
368. Robleto, E.A., Kmiecik, K., Oplinger, E.S., Nienhuis, J., and Triplett, E.W. 1998. Trifolitoxin production increases nodulation competitiveness of Rhizobium etli CE3 under agricultural conditions. Appl. Environ. Microbiol. 64, 2630.
369. Rodelas, B., Gonzalez-Lopez, J., Salmeron, V., Martinez-Toledo, M.V., and Pozo, C. 1998. Symbiotic effectiveness and bacteriocin production by Rhizobium leguminosarum bv viceae isolated from agricultural soils in Spain. Appl. Soil Ecol. 8, 51.
370. Rodelas, B., Lithgow, J.K., Wisniewski-Dye, P., Hardman, A., Wilkinson, A., Economou, A., Williams, P., and Downie, J.A. 1999. Analysis of quorum-sensing-dependent control of rhizosphere-expressed (rhi) genes in Rhizobium leguminosarum bv. viciae. J. Bacteriol. 181, 3816.
371. Rodriguez, H., and Fraga, R. 1999. Phosphate solubilizing bacteria and their role in plant growth promotion. Biotech. Adv. 17, 319.
372. Rodriguez-Herva, J.J., Reniero, D., Galli, E., and Ramos, J.L. 1999. Cell envelope mutants of Pseudomonas putida: Physiological characterization and analysis of their ability to survive in soil. Environ. Microbiol. 1, 479.
373. Rondon, M.R., Goodman, R.M., and Handelsman. J. 1999. The Earth's bounty: Assessing and accessing soil microbial diversity. Trends Biotechnol. 17, 403.
374. Rosenblueth, M., Hynes, M.F., and Martinez-Romero, E. 1998. Rhizobium tropici teu genes involved in specific uptake of Phaseolus vulgaris bean-exudate compounds. Mol. Gen. Genet. 258, 587.
375. Rovira, A.D. 1959. Root excretions in relation to the rhizosphere effect IV. Influence of plant species, age of plant, light, temperature, and calcium nutrition on exudation. Plant Soil 11, 53.
376. Sadasivan, L., and Neyra, C.A. 1987. Cyst production and brown pigment formation in aging cultures of Azospirillum brasilense ATCC 29145. J. Bacteriol. 169, 1670.
377. Sanchez-Contreras, M., Martin, M., Villacieros, M., O'Gara, P., Bonilla, L., and Rivilla, R. 2002. Phenotypic selection and phase variation occur during alfalfa root colonization by Pseudomonas fluorescens F113. J. Bacteriol. 184, 1587.
378. Sauer, K., and Camper, A.K. 2001. Characterization of phenotypic changes in Pseudomonas putida in response to surface-associated growth. J. Bacteriol. 183, 6579.
379. Savka, M.A., Dessaux, Y., Oger, P., and Rossbach, S. 2002. Engineering bacterial competitiveness and persistence in the phytosphere. Mol. Plant Microbe Interact. 15, 866.
380. Schauder, S., Shokat, K., Surette, M.G., and Bassler, B.L. 2001. The LuxS family of bacterial autoinducers: Biosynthesis of a novel quorum-sensing signal molecule. Mol. Microbiol. 41, 463.
381. Schell, M.A. 2000. Control of virulence and pathogenicity genes of Ralstonia solanacearum by an elaborate sensory network. Annu. Rev. Phytopathol. 38, 263.
382. Schippers, B., Bakker, A.W., Bakker, P.A.H.M., and van Peer, R. 1991. Beneficial and deleterious effects of HCN-producing Pseudomonads on rhizosphere interactions in The rhizosphere and plant growth, Keister, D.L. and Cregan, P.B., Eds. Dordrecht.
383. Schlaman, H.R., Okker, R.J., and Lugtenberg, B.J. 1992. Regulation of nodulation gene expression by NodD in rhizobia. J. Bacteriol. 174, 5177.
384. Schloter, M., Wiehe, W., Assmus, B., Steindl, H., Becke, H., Hoflich, G., and Hartmann, A. 1997. Root colonization of different plants by plant-growth-promoting Rhizobium leguminosarum bv. trifolii R39 studied with monospecific polyclonal antisera. Appl. Environ. Microbiol. 63, 2038.
385. Schmidt-Eisenlohr, H., Gast, A., and Baron, C. 2003. Inactivation of gacS does not affect the competitiveness of Pseudomonas chlororaphis in the Arabidopsis thaliana rhizosphere. Appl. Environ. Microbiol. 69, 1817.
386. Schripsema, J., de Rudder, K.E., van Vliet, T.B., Lankhorst, P.P., de Vroom, E., Kijne, J.W., and van Brussel, A.A. 1996. Bacteriocin small of Rhizobium leguminosarum belongs to the class of N-acyl-L-homoserine lactone molecules, known as autoinducers and as quorum sensing co-transcription factors. J. Bacteriol. 178, 366.
387. Semenov, A.M., van Bruggen, A.H.C., and Zelenev, V.V. 1999. Moving waves of bacterial populations and total organic carbon along roots of wheat. Microb. Ecol. 37, 116.
388. Sevilla, M., Gunapala, N., Burris, R.H., and Kennedy, C. 2001. Enhancement of growth and N content in sugarcane plants inoculated with Acetobacter diazotrophicus. Mol. Plant Microbe Interact. 14, 358.
389. Simons, M., Permentier, H.P., de Weger, L.A., Wijffelman, C.A., and Lugtenberg, B.J.J. 1997. Amino acid synthesis is necessary for tomato root colonization by Pseudomonas fluorescens strain WCS365. Mol. Plant Microbe Interact. 10, 102.
390. Simons, M., van der Bij, A.J., Brand, I., de Weger, L.A., Wijffelman, C.A., and Lugtenberg, B.J. 1996. Gnotobiotic system for studying rhizosphere colonization by plant growth-promoting Pseudomonas bacteria. Mol. Plant Microbe Interact. 9, 600.
391. Skerker, J.M., and Berg, H.C. 2001. Direct observation of extension and retraction of type IV pili. Proc. Natl. Acad. Sci. USA 98, 6901.
392. Skvortsov, I.M., and Ignatov, V.V. 1998. Extracellular polysaccharides and polysaccharide-containing biopolymers from Azospirillum species: Properties and the possible role in interaction with plant roots. FEMS Microbiol. Lett. 165, 223.
393. Skvortsov, I., Konnova, S., Makarov, O., Prokhorova, R., and Ignatov, V. 1995. Azospirillum brasilense exopolysaccharide complexes, their possible involvement in bacteria-wheat roots interactions and the suggested nature of these interactions in Azospirillum VI and related microorganisms: Genetics, physiology, ecology, Fendrik, I., Del Gallo, M., Vanderleyden, J., and de Zamaroczy, M., Eds. Berlin Heidelberg.
394. Sly, L.I., and Stackebrandt, E. 1999. Description of Skermanella parooensis gen. nov., sp. nov. to accommodate Conglomeromonas largomobills subsp. parooensis following the transfer of Conglomeromonas largomobilis subsp. largomobilis to the genus Azospirillum. Int. J. Syst. Bacteriol. 49, 541.
395. Smalla, K., Wieland, G., Buchner, A., Zock, A., Parzy, J., Kaiser, S., Roskot, N., Heuer, H., and Berg, G. 2001. Bulk and rhizosphere soil bacterial communities studied by denaturing gradient gel electrophoresis: Plant-dependent enrichment and seasonal shifts revealed. Appl. Environ. Microbiol. 67, 4742.
396. 2+-dependent adhesin in the attachment of Rhizobium leguminosarum to pea root hair tips. J. Bacteriol. 169, 4294.
397. Smit, G., Swart, S., Lugtenberg, B.J., and Kijne, J.W. 1992. Molecular mechanisms of attachment of Rhizobium bacteria to plant roots. Mol. Microbiol. 6, 2897.
398. Song, S.-C., and Lin, L.-P. 1999. The transition of Rhizobium fredii lipopolysaccharides induced by soybean root exudation. Bot. Bull. Acad. Sinica 40, 73.
399. Southward, C.M., and Surette, M.G. 2002. The dynamic microbe: Green fluorescent protein brings bacteria to light. Mol. Microbiol. 45, 1191.
400. Spaink, H.P. 2000. Root nodulation and infection factors produced by rhizobial bacteria. Annu. Rev. Microbiol. 54, 257.
401. Stachel, S.E., Van Montagu, M., and Zambryski, P. 1985. Identification of the signal molecules produced by wounded plant cells that activate T-DNA transfer in Agrobacterium tumefaciens. Nature 318, 624.
402. Standing, D., Meharg, A.A., and Killham, K. 2003. A tripartite microbial reporter gene system for real-time assays of soil nutrient status. FEMS Microbiol. Lett. 220, 35.
403. Steele, H.L., Werner, D., and Cooper, J.E. 1999. Flavonoids in seed and root exudates of Lotus pedunculatus and their biotransformation by Mesorhizobium loti, Physiol. Plantarum 107, 251.
404. Steenhoudt, O., and Vanderleyden, J. 2000. Azospirillum, a free-living nitrogen-fixing bacterium closely associated with grasses: Genetic, biochemical and ecological aspects. FEMS Microbiol. Rev. 24, 487.
405. Steenhoudt, O., Keijers, V., Okon, Y., and Vanderleyden, J. 2001. Identification and characterization of a periplasmic nitrate reductase in Azospirillum brasilense Sp245. Arch. Microbiol. 175, 344.
406. Steidle, A., Sigl, K., Schuhegger, R., Ihring, A., Schmid, M., Gantner, S., Stoffels, M., Riedel, K., Givskov, M., Hartmann, A., Langebartels, C., and Eberl, L. 2001. Visualization of N-acylhomoserine lactone-mediated cell-cell communication between bacteria colonizing the tomato rhizosphere. Appl. Environ. Microbiol. 67, 5761.
407. Sternberg, C., Christensen, B.B., Johansen, T., Toftgaard, N.A., Andersen, J.B., Givskov, M., and Molin, S. 1999. Distribution of bacterial growth activity in flow-chamber biofilms. Appl. Environ. Microbiol. 65, 4108.
408. Streit, W.R., and Phillips, D.A. 1996. Recombinant Rhizobium meliloti strains with extra biotin synthesis capability. Appl. Environ. Microbiol. 62, 3333.
409. Streit, W.R., Joseph, C.M., and Phillips, D.A. 1996. Biotin and other water-soluble vitamins are key growth factors for alfalfa root colonization by Rhizobium meliloti 1021. Mol. Plant Microbe Interact. 9, 330.
410. Stuurman, N., Bras, C.P., Schlaman, H.R., Wijfjes, A.M., Bloemberg, G., and Spaink, H.P. 2000. Use of green fluorescent protein color variants expressed on stable broad-host-range vectors to visualize rhizobia interacting with plants. Mol. Plant Microbe Interact. 13, 1163.
411. Sundin, P. 1990. Plant root exudates in interaction between plants and soil microorganisms. PhD Dissertation Lund University, Sweden.
412. Surette, M.G., Miller, M.B., and Bassler, B.L. 1999. Quorum sensing in Escherichia coli, Salmonella typhimurium and Vibrio harveyi: A new family of genes responsible for autoinducer production. Proc. Natl. Acad. Sci. USA 96, 1639.
413. Swart, S. 1994. Rhicadhesin-mediated attachment of Rhizobiaceae, PhD Dissertation, Rijksuniversiteit Leiden, The Netherlands.
414. Swift, S., Bainton, N.J., and Winson, M.K. 1994. Gram-negative bacterial communication by N-acyl homoserine lactones: A universal language? Trends Microbiol. 2,193.
415. Tarrand, J.J., Döbereiner, J., and Döbereiner, J. 1978. A taxonomic study of the Spirillum lipoferum group, with descriptions of a new genus, Azospirillum gen. nov. and two species, Azospirillum lipoferum (Beijerinck) comb. nov. and Azospirillum brasilense sp. nov., Can. J. Microbiol. 24, 967.
416. Tate, M.E., Murphy, P.J., Roberts, W.P., and Kerr, A. 1979. Adenine N7-substituent of agrocin 84 determines its bacteriocin-like specificity., Nature 280, 797.
417. Tate, R., Riccio, A., Caputo, E., Iaccarino, M., and Patriarca, E.J. 1999. The Rhizobium etli metZ gene is essential for methionine biosynthesis and nodulation of Phaseolus vulgaris. Mol. Plant Microbe Interact. 12, 24.
418. Teplitski, M., Robinson, J.B., and Bauer, W.D. 2000. Plants secrete substances that mimic bacterial N-acyl homoserine lactone signal activities and affect population density-dependent behaviors in associated bacteria. Mol. Plant Microbe Interact. 13, 637.
419. Thomashow, L.S., and Weller, D.M. 1991. Role of antibiotics and siderophores in biocontrol of take-all disease of wheat in The rhizosphere and plant growth, Keister, D.L., and Cregan, P.B., Eds. Dordrecht.
420. Thomashow, L.S. 1996. Biological control of plant root pathogens. Curr. Opin. Biotechnol. 7, 343.
421. Thomson, N.R., Crow, M.A., McGowan, S.J., Cox, A., and Salmond, G.P. 2000. Biosynthesis of carbapenem antibiotic and prodigiosin pigment in Serratia is under quorum sensing control. Mol. Microbiol. 36, 539.
422. Thorne, S.H., and Williams, H.D. 1999. Cell density-dependent starvation survival of Rhizobium leguminosarum bv. phaseoli: Identification of the role of an N-acyl homoserine lactone in adaptation to stationary-phase survival. J. Bacteriol. 181, 981.
423. Tien, T.M., Gaskins, M.H., and Hubbell, D.A. 1979. Plant growth substances produced by Azospirillum brasilense and their effect on the growth of pearl millet (Pennisetum americanum L.). Appl. Environ. Microbiol. 37, 1016.
424. Tombolini, R., Unge, A., Davey, M.E., deBruijn, F.J., and Jansson, J.K. 1997. Flow cytometric and microscopic analysis of GFP-tagged Pseudomonas fluorescens bacteria. FEMS Microbiol. Ecol. 22, 17.
425. Torsvik, V., and Ovreas, L. 2002. Microbial diversity and function in soil: From genes to ecosystems. Curr. Opin. Microbiol. 5, 240.
426. Triplett, E.W., and Sadowsky, M.J. 1992. Genetics of competition for nodulation of legumes. Annu. Rev. Microbiol. 46, 399.
427. Turnbull, G.A., Morgan, J.A.W., Whipps, J.M., and Saunders, J.R. 2001a. The role of motility in the in vitro attachment of Pseudomonas putida PaWS to wheat roots. FEMS Microbiol. Ecol. 35, 57.
428. Turnbull, G.A., Morgan, J.A.W., Whipps, J.M., and Saunders, J.R. 2001b. The role of bacterial motility in the survival and spread of Pseudomonas fluorescens in soil and in the attachment and colonisation of wheat roots. FEMS Microbiol. Ecol. 36, 21.
429. Unge, A., and Jansson, J. 2001. Monitoring population size, activity, and distribution of gfp-luxAB-tagged Pseudomonas fluorescens SBW25 during colonization of wheat. Microb. Ecol 41, 290.
430. Valdivia, R.H., and Falkow, S. 1996. Bacterial genetics by flow cytometry: Rapid isolation of Salmonella typhimurium acid-inducible promoters by differential fluorescence induction. Mol. Microbiol. 22, 367.
431. Valdivia, R.H., and Falkow, S. 1998. Flow cytometry and bacterial pathogenesis. Curr. Opin. Microbiol. 1, 359.
432. Valdivia, R.H., and Falkow, S. 1997a. Fluorescence-based isolation of bacterial genes expressed within host cells. Science 277, 2007.
433. Valdivia, R.H., and Falkow, S. 1997b. Probing bacterial gene expression within host cells. Trends Microbiol. 5, 360.
434. Van Bastelaere, E., Lambrecht, M., Vermeiren, H., Van Dommelen, A., Keijers, V, Proost, P., and Vanderleyden, J. 1999. Characterization of a sugar-binding protein from Azospirillum brasilense mediating chemotaxis to and uptake of sugars. Mol. Microbiol. 32, 703.
435. Vanbleu, E., Marchal, K., Lambrecht, M., Mathys, V, and Vanderleyden, J., 2004. Annotation of the pRhico plasmid of Azospirillum brasilense reveals its role in determining the outer surface composition. FEMS Microbiol. Letters 232(2), 165-172.
436. Van Dommelen, A., Keijers, V, Vanderleyden, J., and de Zamaroczy, M. 1998. (Methyl)ammonium transport in the nitrogen-fixing bacterium Azospirillum brasilense. J. Bacteriol. 180, 2652.
437. van Loon, L.C., Bakker, P.A.H.M., and Pieterse, C.M.J. 1998. Systemic resistance induced by rhizosphere bacteria. Annu. Rev. Phytopathol. 36, 453.
438. Van Overbeek, L.S., and Van Elsas, J.D. 1995. Root exudate-induced promoter activity in Pseudomonas fluorescens mutants in the wheat rhizosphere. Appl. Environ. Microbiol. 61, 890.
439. van Rhijn, P., Fujishige, N.A., Lim, P.O., and Hirsch, A.M. 2001. Sugar-binding activity of pea lectin enhances heterologous infection of transgenic alfalfa plants by Rhizobium leguminosarum biovar viciae. Plant Physiol. 126, 133.
440. van Rhijn, P., Goldberg, R.B., and Hirsch, A.M. 1998. Lotus comiculatus nodulation specificity is changed by the presence of a soybean lectin gene. Plant Cell 10, 1233.
441. Vande Broek, A., and Vanderleyden, J. 1995. Review: Genetics of the Azospirillum-plant root association. Crit. Rev. Plant Sciences 14, 445.
442. Vande Broek, A., and Vanderleyden, J. 1995. The role of bacterial motility, chemotaxis, and attachment in bacteria-plant interactions. Mol. Plant Microbe Interact. 8, 800.
443. Vande Broek, A., Lambrecht, M., and Vanderleyden, J. 1998. Bacterial chemotactic motility is important for the initiation of wheat root colonization by Azospirillum brasilense. Microbiology 144, 2599.
444. Vande Broek, A., Lambrecht, M., Eggermont, K., and Vanderleyden, J. 1999. Auxins upregulate expression of the indole-3-pyruvate decarboxylase gene in Azospirillum brasilense. J. Bacteriol 181, 1338.
445. Vande Broek, A., Michiels, J., Van Gool, A., and Vanderleyden, J. 1993. Spatial-temporal colonization patterns of Azospirillum brasilense on the wheat root surface and expression of the bacterial nifH gene during association. Mol. Plant Microbe Interact. 6, 592.
446. Vermeiren, H., Willems, A., Schoofs, G., De Mot, R., Keijers, V., Hai, W., and Vanderleyden, J. 1999. The rice inoculant strain Alcaligenes faecalis A15 is a nitrogen-fixing Pseudomonas stutzen. Syst. Appl. Microbiol. 22, 215.
447. Vesper, S.J. 1987. Production of pili (fimbriae) by Pseudomonas fluorescens and correlation with attachment to corn roots. Appl. Environ. Microbiol. 53, 1397.
448. Vilchez, S., Molina, L., Ramos, C., and Ramos, J.L. 2000. Proline catabolism by Pseudomonas putida: Cloning, characterization, and expression of the put genes in the presence of root exudates. J. Bacteriol. 182, 91.
449. Viprey, V, Del Greco, A., Golinowski, W., Broughton, W.J., and Perret, X. 1998. Symbiotic implications of type III protein secretion machinery in Rhizobium. Mol. Microbiol. 28, 1381.
450. Visca, P., Leoni, L., Wilson, M.J., and Lamont, I.L. 2002. Iron transport and regulation, cell signalling and genomics: Lessons from Escherichia coli and Pseudomonas. Mol. Microbiol. 45, 1177.
451. Volpin, H., and Phillips, D.A. 1998. Respiratory elicitors from Rhizobium meliloti affect intact alfalfa roots. Plant Physiol. 116, 777.
452. Waelkens, F., Maris, M., Verreth, C., Vanderleyden, J., and Van Gool, A. 1987. Azospirillum DNA shows homology with Agrobacterium chromosomal virulence genes. FEMS Microbiol. Lett. 43, 241.
453. Walker, R., Rossall, S., and Asher, M.J. 2002. Colonization of the developing rhizosphere of sugar beet seedlings by potential biocontrol agents applied as seed treatments. J. Appl. Microbiol. 92, 228.
454. Walker, T.S., Bais, H.P., Grotewold, E., and Vivanco, J.M. 2003. Root exudation and rhizosphere biology. Plant Physiol. 132, 44.
455. Wang, L.H., He, Y., Gao, Y., Wu, J.E., Dong, Y.H., He, C., Wang, S.X., Weng, L.X., Xu, J.L., Tay, L., Fang, R.X., and Zhang, L.H. 2004. A bacterial cell-cell communication signal with cross-kingdom structural analogues. Mol. Microbiol. 51, 903.
456. Watnick, P., and Kolter, R. 2000. Biofilm, city of microbes. J. Bacteriol. 182, 2675.
457. Whipps, J.M. 2001. Microbial interactions and biocontrol in the rhizosphere. J. Exp. Bot. 52, 487.
458. Whitehead, N.A., Byers, J.T., Commander, P., Corbett, M.J., Coulthurst, S.J., Everson, L., Harris, A.K., Pemberton, C.L., Simpson, N.J., Slater, H., Smith, D.S., Welch, M., Williamson, N., and Salmond, G.P. 2002. The regulation of virulence in phytopathogenic Erwinia species: Quorum sensing, antibiotics and ecological considerations. Antonie Van Leeuwenhoek 81, 223.
459. Wilson, R.A., Handley, B.A., and Beringer, J.E. 1997. Bacteriocin production and resistance in a field population of Rhizobium leguminosarum biovar viciae. Soil Biol. Biochem. 30, 413.
460. Winans, S.C. 1991. An Agrobacterium two-component regulatory system for the detection of chemicals released from plant wounds. Mol. Microbiol. 5, 2345.
461. Wood, D.W., Gong, F., Daykin, M.M., Williams, P., and Pierson, L.S., III, 1997. N-acyl-homoserine lactone-mediated regulation of phenazine gene expression by Pseudomonas aureofaciens 30-84 in the wheat rhizosphere. J. Bacteriol. 179, 7663.
462. Yang, C.H., and Crowley, D.E. 2000. Rhizosphere microbial community structure in relation to root location and plant iron nutritional status. Appl. Environ. Microbiol. 66, 345.
463. Yang, G., Bhuvaneswari, T.V., Joseph, C.M., King, M.D., and Phillips, D.A. 2002. Roles for riboflavin in the Sinorhizobium-alfalfa association. Mol. Plant Microbe Interact. 15, 456.
464. Yeomans, C.V., Porteous, F., Paterson, E., Meharg, A.A., and Killham, K. 1999. Assessment of lux-marked Pseudomonas fluorescens for reporting on organic carbon compounds. FEMS Microbiol. Lett. 176, 79.
465. York, G.M., Gonzalez, J.E., and Walker, G.C. 1996. Exopolysaccharides and their role in nodule invasion in Biology of plant microbe interactions: Proceedings of the 8th International Symposium on Molecular Plant-Microbe Interactions Knoxville, Tennessee, 14-19 July 1996, Stacey, G., Mullin, B., and Gresshoff, P.M., Eds. St. Paul.
466. You, C.B., Lin, M., Fang, X.J., and Song, W. 1995. Attachment of Alcaligenes to rice roots. Soil Biol. Biochem. 27, 463.
467. Zanker, H., von Lintig, J., and Schroder, J. 1992. Opine transport genes in the octopine (occ) and nopaline (noc) catabolic regions in Ti plasmids of Agrobacterium tumefaciens. J. Bacteriol. 174, 841.
468. Zhang, L., Murphy, P.J., Kerr, A., and Tate, M.E. 1993. Agrobacterium conjugation and gene regulation by N-acyl-L-homoserine lactones. Nature 362, 446.
469. Zhang, Y., Burns, R.H., Ludden, P.W., and Roberts, G.P. 1997. Regulation of nitrogen fixation in Azospirillum brasilense. FEMS Microbiol. Lett. 152, 195.
470. Zhu, G.Y., Dobbelaere, S., and Vanderleyden, J. 2002. Use of green fluorescent protein to visualize rice root colonization by Azospirillum irakense and A. brasilense. Fund. Plant Biol. 29, 1279.
471. Zhu, Y., Pierson, L.S., III, and Hawes, M.C. 1997. Induction of microbial genes for pathogenesis and symbiosis by chemicals from root border cells. Plant Physiol. 115, 1691.
472. Zhulin, I.B., and Armitage, J.P. 1992. The role of taxis in the ecology of Azospirillum. Symbiosis 13, 199.
473. Zhulin, I.B., and Taylor, B.L. 1995. Chemotaxis in plant-associated bacteria: The search for the ecological niche in Azospirillum VI and related organisms: Genetics, physiology, ecology, Fendrik, I., Del Gallo, M., Vanderleyden, J., and de Zamaroczy, M., Eds. Berlin Heidelberg.
474. Zhulin, I.B., Sarmiento, L.E., and Taylor, B.L. 1995. Changes in membrane potential upon chemotactic stimulation of Azospirillum brasilense in Azospirillum VI and related organisms: Genetics, physiology, ecology, Fendrik, I., Del Gallo, M., Vanderleyden, J., and de Zamaroczy, M., Eds. Berlin Heidelberg.