Rhizosphere Population Dynamics and Internal Colonization of Cucumber by Plant Growth-Promoting Rhizobacteria which Induce Systemic Resistance to ColletotrichumOrbiculare

  • Joseph W. Kloepper
  • Gang Wei
  • Sadik Tuzun
Part of the NATO ASI Series book series (NSSA, volume 230)


Plant growth-promoting rhizobacteria (PGPR) are root-colonizing bacteria which exert a beneficial effect on plant development. The reported beneficial effects of PGPR include plant growth promotion (Kloepper et al., 1991) and reductions in the incidence of soilborne diseases (Kloepper, 1991; Weller, 1988). Due to their effects on crops, PGPR hold promise for use in integrated strategies for implementing low-input sustainable agriculture. Implementation of large-scale field use of these bacterial inoculants will require decreasing the variability of field performance which appears to be innate with most inoculants consisting of single bacterial strains. One approach to reducing variability is to use mixed inoculants consisting of two or more bacterial strains with different mechanisms. This approach depends upon having identifiable differences in mechanisms. Most of the PGPR and bacterial biological control agents which have been reported to date were first selected by antibiosis in vitro toward fungal pathogens (Weller, 1988) and then tested for biological control activity in disease assays with the host plant. Hence, it is not surprising that most suggested mechanisms for growth promotion and biological control by rhizobacteria involve antibidtics, siderophores, HCN, or other compounds which can be broadly called antifungal compounds (Kloepper, 1991; Weller, 1988). Competition for infection sites or nutrients (other than iron) and parasitism are other mechanisms which have been reported to relate to biological control with a few rhizobacterial strains (Kloepper, 1991).


Biological Control Systemic Resistance True Leaf Cyanic Acid Soilborne Disease 
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Literature Cited

  1. Ahl, P., Voisard, C., and Défago, G., 1986, Iron bound siderophores, cyanic acid, and antibiotics involved in suppression of Thielaviopsis basicola by a Pseudomonas fluorescens strain, J. Phytopathol., 116: 121.CrossRefGoogle Scholar
  2. Albert, R., and Anderson, A. J., 1987, The effect of Pseudomonas putida colonization on root surface peroxidase, Plant Physiol., 85: 537.PubMedCrossRefGoogle Scholar
  3. Anderson, A. J., and Guerra, D., 1985, Responses of bean to root colonization with Pseudomonas putida in a hydroponic system, Phytopathology, 75: 992.CrossRefGoogle Scholar
  4. Frommel, M. I., Nowak, J., and Lazarovits, G., 1991, Growth enhancement and developmental modifications of in vitro grown potato (Solanum tuberosum sp. tuberosum) as affected by a non-fluorescent Pseudomonas sp., Plant Physiol., (in press).Google Scholar
  5. Hynes, R. K., and Lazarovits, G., 1989, Effect of seed treatment with plant growth-promoting rhizobacteria on the protein profiles of intercellular fluids from bean and tomato leaves, Can. J. Plant Pathol., 11: 191.Google Scholar
  6. Kloepper, J. W., 1991, Plant growth-promoting rhizobacteria as biological control agents, in: “Soil Microbial Technologies”, B. Metting, ed., Marcel Dekker, Inc., New York.Google Scholar
  7. 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”, D. L. Keister and P. B. Gregan, eds., Plant and Soil Press, Wageningen, The Netherlands.Google Scholar
  8. Kuc, J., Shockley, G., and Kearney, K., 1975, Protection of cucumber against Colletotrichum lagenarium by Colletotrichum lagenarium, Physiol. Plant Pathol., 7: 195.CrossRefGoogle Scholar
  9. van Peer, R., and Schippers, B., 1991, Biocontrol of Fusarium wilt by Pseudomonas sp. strain WCS417r: induced resistance and phytoalexin accumulation, in: “Biotic Interactions and Soil-Borne Diseases”, A. B. R. Beemster, G. J., Bollen, M., Gerlagh, M. A., Ruissen, B., Schippers, and A., Tempel, eds., Elsevier, Oxford, New York, Tokyo.Google Scholar
  10. Voisard, C., Keel, C., Haas, D., and Défago, G., 1989, Cyanide production by Pseudomonas fluorescens helps suppress black root rot of tobacco under gnotobiotic conditions, EMBO J., 8: 351.PubMedGoogle Scholar
  11. Wei, G., Kloepper, J. W., and Tuzun, S., 1991, Induction of systemic resistance with seed treatment by PGPR strains, in: “Plant Growth-Promoting Rhizobacteria-Progress and Prospect”, C. Keel, B. Koller, and G. Défago, eds., International Organization for Biological Control, Wageningen, The Netherlands.Google Scholar
  12. Weller, D. M., 1988, Biological control of soilborne plant pathogens in the rhizosphere with bacteria, Annu. Rev. Phytopathol., 26: 379.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • Joseph W. Kloepper
    • 1
  • Gang Wei
    • 1
  • Sadik Tuzun
    • 1
  1. 1.Department of Plant Pathology and Alabama Agricultural Experiment StationAuburn UniversityUSA

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