Abstract
The plant growth-promoting rhizobacteria (PGPR) are naturally occurring soil bacteria that aggressively colonize plant roots and benefit plants by providing growth promotion. Inoculation of crop plants with certain strains of PGPR at an early stage of development improves biomass production through direct effects on root and shoot growth. These PGPR can enhance plant growth by a wide variety of mechanisms like nutrient solubilization (P, K, and Zn), siderophore production, biological nitrogen fixation (BNF), rhizosphere engineering, phytohormone production, exhibiting antifungal activity, production of volatile organic compounds (VOC), induction of systemic resistance (ISR), 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.
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