Author(s):
Amitabh Singh, KP Singh, Meenakshi Singh, P Bhareti and UP Singh
Abstract:
The plant growth-promoting activities of 22 isolates of
Pseudomonas fluorescens and
Bacillus spp
. were assess against three spore forming fungi (
Alternaria spp
., Fusarium spp.
, Bipolaris spp.). The bacterial isolates showed that differed in PGP range and activities, varied greatly among the isolates. The strain R-3 exhibited siderophore production, three strains (C-03, C6, R-4) solubilized phosphate, 5 strains of
Pseudomonas fluorescens (CRM-3, R-3, C6, PSB-2, C-05) produced HCN and the
Bacillus spp
. showed antifungal activity against the spore forming fungi i.e.
Alternaria spp
., Fusarium spp.
, Bipolaris spp.
P. fluorescens did not show any inhibition against the spores of the phytopathogenic fungi.
Bacillus sp. and
P. fluorescens are used for enhancing the growth of plants and eradicating diseases caused by bacteria and fungi. HPLC analysis showed that there was considerable amount of gallic acid present in all the three extracts of
Bacillus spp.
that confirmed the inhibitory effect showed in the dual plate assay against the tested fungi. The bacterial isolates differed in PGP activities and varied greatly among the isolates. The
Bacillus sp. and
P. fluorescens are used for enhancing the growth of plants and eradicating diseases caused by bacteria and fungi. The considerable amount of gallic acid present in all the three extracts of
Bacillus spp.
that confirmed the inhibitory effect showed in the dual plate assay against the tested fungi. This study provides a comprehensive assessment of 22 isolates of
Pseudomonas fluorescens and
Bacillus spp
. The antifungal metabolites produced by
Bacillus spp
. need to be isolated, purified and tested in field for commercialization.
Amitabh Singh, KP Singh, Meenakshi Singh, P Bhareti and UP Singh. Antifungal activity of some strains of plant growth-promoting rhizobacteria. J Pharmacogn Phytochem 2017;6(6):577-582.