Plant growth-promoting rhizobacteria (PGPR): emergence in agriculture |
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Authors: | P N Bhattacharyya D K Jha |
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Institution: | (1) Department of Botany, Microbial Ecology Laboratory, Gauhati University, Guwahati, Assam, 781014, India; |
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Abstract: | Plant growth-promoting rhizobacteria (PGPR) are the rhizosphere bacteria that can enhance plant growth by a wide variety of
mechanisms like phosphate solubilization, siderophore production, biological nitrogen fixation, rhizosphere engineering, production
of 1-Aminocyclopropane-1-carboxylate deaminase (ACC), quorum sensing (QS) signal interference and inhibition of biofilm formation,
phytohormone production, exhibiting antifungal activity, production of volatile organic compounds (VOCs), induction of systemic
resistance, promoting beneficial plant-microbe symbioses, interference with pathogen toxin production etc. The potentiality
of PGPR in agriculture is steadily increased as it offers an attractive way to replace the use of chemical fertilizers, pesticides
and other supplements. Growth promoting substances are likely to be produced in large quantities by these rhizosphere microorganisms
that influence indirectly on the overall morphology of the plants. Recent progress in our understanding on the diversity of
PGPR in the rhizosphere along with their colonization ability and mechanism of action should facilitate their application
as a reliable component in the management of sustainable agricultural system. The progress to date in using the rhizosphere
bacteria in a variety of applications related to agricultural improvement along with their mechanism of action with special
reference to plant growth-promoting traits are summarized and discussed in this review. |
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