ABSTRACT
The application of Plant Growth Promoting Rhizobacteria (PGPR) to control diseases is an environmentally friendly approach. Shoot elongation is controlled by various plant growth hormones such as cytokinins, gibberellins and auxins. Agriculturists have attracted attention towards phosphate-solubilizing PGPR as a soil inoculate as it helps in increasing plant growth and productivity. In indirect mechanisms PGPR increases the natural resistance of the host, producing repressive substances that neutralize the deleterious effects of phytopathogens on plants. Plants developed specific response mechanisms after being frequently subjected to various environmental stresses. Suppression of disease from soilborne pathogens includes competition for nutrients, production of antimicrobial compounds which protect plants from phytopathogens and destruction of fungal cell walls or nematode structures by releasing lytic enzymes. PGPR producing certain metabolites that promote plant growth and protect plants from phytopathogenic agents. The plant–PGPR cooperation plays a major role by enhancing the growth and health of widely diverse plants.
