Abstract
Rhizosphere is the unique vicinity which acts as a battlefield for soil microflora and a source of useful metabolites and nutrients for plants. Plant growth-promoting rhizobacteria (PGPR) associate with the roots of various plants to nourish them through direct and indirect mechanisms. Direct mechanisms of PGPR-based plant growth include nutrient acquisition from soil, production of various metabolites like phytohormones and siderophores, etc. Indirect mechanisms improve the plant health by controlling various plant pathogens by producing antibiotics, hydrolytic enzymes, and 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity, induction of systemic resistance, etc. In this chapter, the brief introduction about PGPR and their interactions with plant roots are presented followed by a detailed insight into the mechanisms utilized by PGPR in rhizosphere to boost plant growth. In addition, some factors that affect PGPR-plant associations are elaborated. Finally, it has been reviewed that, if wisely utilized, PGPR may serve as future prospects to supplement chemical fertilizers.
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