Studying Microbial Diversity Having Biofertilizing and Bioantagonistic Traits from Finger Millet Rhizosphere of Bastar Plateau of Chhattisgarh

A total of 111 rhizobacterial isolates were isolated from 24 rhizospheric soil samples collected from different finger millet growing locations of Bastar plateau of Chhattisgarh. Of these 111 isolates, 40 were found to antagonize Pyricularia grisea in the range of 22.22-44.44 %, 38 to Rhizoctonia solani ranging 22.22-38.89 % and 30 to both. Of 30, 24 isolates reduced growth of Pyricularia grisea by producing volatile biocidal compounds while 14 inhibited growth of Rhizoctonia solani. Three bacterial isolates produced HCN while all of them produced ammonia (90.334.38 μmol/ml). Twenty three of 30 isolates produced siderophore in the range of 1.13.82. Eighteen bacterial isolates produced β,1-4 glucanases (1.22-2.36) and amylase (1.35-2.33 ) while 17 were positive for protease (1.38-2.61). Screening of 30 antagonistic bacterial isolates for P-solubilization ability revealed that 19 could solubilize tricalcium phosphate in the range of 1.58-2.55. All the isolates tested positive for IAA production, however, presence of tryptophan greatly affected the IAA production pattern of isolates. In the absence of tryptophan, IAA production ranged from 1.74-4.86 μg/ml in contrast to 3.48-38.08μg/ml in presence of tryptophan.