Vol. 11, Special Issue 8 (2022)

Author(s):
K Sukanya, K Kumutha, R Subhashini and P Kannan

Abstract:
Exopolysaccharides are the high molecular weight polymeric substances, which have been secreted by the microorganisms as tightly bound capsule or loosely attached slime layer. EPS have the potential to preserve the structural integrity of the soil, stimulate soil fertility, and optimize soil health. In this study, exopolysaccharides producing microbes were isolated from the drought soil. The biochemical characterization and screening of the isolates for the production of exopolysaccharides by phenol sulfuric acid method were carried out. The obtained results revealed that 3 out of 19 cultures (Rhizobium spp., Bacillus megaterium and Lysinibacillus sphaericus), were known to produce consummate amount of EPS at the rate of 50.00 mg/ml, 49.89 mg/ml and 49.67 mg/ml respectively. Also, these isolates ensured to produce higher quantity of IAA, GA3, PO₄ solubilization and K release. Hence, these cultures were considered for EPS production, thereby improving soil aggregation and stimulating crop growth.