“…This category of bacteria has been refered as plant growth promoting bacteria, which include the strains of genera like Pseudomonas, Azospirillum, Burkholderia, Bacillus, Enterobacter, Rhizobium, Erwinia, Serratia, Alcaligenes, Arthrobacter, Acinetobacter and Flavobacterium. Rhizobial bacteria have been proved to act as promising plant growth promoters. In the recent years the PGPR have attracted a cosmopolitain significance for their applications as a potential tool for sustaining agriculture production and improving soil health (Arshad et al, 2008). The mechanism by which the PGPR affects the plant growth positively can be of two types i.e., direct and indirect.…”