Isolation of bacteria from agricultural soil and screening it for PGPR traits

Rhizobacteria owning multiple plant growth-promoting activities were isolated from the rhizospheric soils of plants flourishing in a semi-arid region. Plant Growth Promoting Rhizobacterial (PGPR) strains were segregated and screened for their plant growth-promoting activities like phosphate solubilization, production of indole- acetic acid, ammonia, hydrogen cyanide (HCN). Bacteria that colonize plant roots and promote plant growth are referred to as plant growth-promoting rhizobacteria (PGPR). PGPR is highly assorted and in this review, we focus on rhizobacteria as biocontrol agents. PGPR can affect growth directly or indirectly. Direct promotion of plant growth by PGPR involves both providing plants with a compound synthesized by the bacterium or helping the uptake of certain nutrients from the environment; while mechanisms of biological control by which rhizobacteria can support plant growth indirectly, i.e., by decreasing the level of disease, include antibiosis, induction of systemic resistance, and struggle for nutrients and niches.