Abstract
Plant growth-promoting rhizobacteria (PGPR) represent a diverse subgroup of rhizosphere-colonizing bacteria. PGPR were first described for root crops in the 1970s when the use of antibiotic resistance made possible the monitoring of introduced bacteria in soil. In recent years, the host list of PGPR has grown to include barley, bean, canola (rapeseed), cotton, maize, peanut, rice, vegetables, wheat, and woody species. In addition to increasing crop yields, different strains of PGPR can exert various effects on plants including biological control of soil-borne pathogens, promotion of legume nodulation by nitrogen-fixing rhizobia, and enhancement of seedling emergence rates. Reported mechanisms of action for PGPR have focussed on the indirect mechanisms of siderophore, antibiotic, or hydrogen cyanide production. Such indirect mechanisms reduce the population densities of deleterious microorganisms and thereby result in increased plant growth. Direct growth promotion by PGPR in the absence of deleterious microorganisms has been recently described.
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© 1991 Springer Science+Business Media Dordrecht
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Zablotowicz, R.M., Tipping, E.M., Lifshitz, R., Kloepper, J.W. (1991). Plant growth promotion mediated by bacterial rhizosphere colonizers. In: Keister, D.L., Cregan, P.B. (eds) The Rhizosphere and Plant Growth. Beltsville Symposia in Agricultural Research, vol 14. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3336-4_70
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DOI: https://doi.org/10.1007/978-94-011-3336-4_70
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