The rhizosphere soil is source for high diversity of microorganisms which play a
major role in the enhancement of the plant. The plant and microbe interaction
influences the plant growth. In the present study 9 different rice rhizosphere soil
samples were collected from different districts of Kolar, Hoskote, Ramnagar and
Mysore. Isolations were done on nutrient agar media by serial dilutions and
different colonies with morphological variation were selected from each dilution. A
total of 53 isolates were differentiated and maintained as pure cultures on nutrient
agar. Morphological and Biochemical characterization was carried out for all the
individual isolates. Both gram positive bacilli and cocci along with gram negative
bacilli and also gram positive branched colonies probably actinomycetes were
isolated in the present investigation. A total of 57 Gram positive bacilli, 6 Gram
negative bacilli, 47 Gram positive cocci and six actinomycetes were isolated of the
total samples used in the current study. 53 isolates were screened for the IAA
production and 6 isolates proved to produce IAA ranging from 0.535 - 14.05μg/ml.
Further the organisms will be screened for production of growth promoting
substances which can be used as natural biofertilisers in the enhancement of the
yield of rice.