Author(s):

Parvesh Kumar, Jagdeep Singh, AK Saini and Bahaderjeet Singh

Abstract: The rhizobacteria with antagonistic activity toward plant pathogens play an essential role in plant growth and development. But, the role of growth-promoting rhizobacteria (PGPR) in the adaptation of plants in extreme environments is yet not completely understood. To analyze the effect of rhizobacteria on plant pathogens, the microbial biodiversity was assessed from the rhizosphere soil of wheat and rice collected from the Malwa region (Talwandi Sabo, Faridkot, Sardulgarh) of Punjab during January 2018 to January 2019 in three Intervals. Nine fungal genera were obtained from the soil of the wheat-rice rhizosphere and identified as follows:- Acremonium sp., Aspergillus spp., Alternaria spp., Curvularia lunata, Cladophialphora bantiana, Helminthosporium sp., Fusarium spp., Mucor sp., Penicillium spp. More than 30 bacterial isolates were obtained from the three different areas and further screened against isolated fungal genera. Out of thirty, two bacterial isolates Bacillus subtilis 2B10 and 2C5 were found to capability in growth inhibition range from 10 to 30 mm and 8 to 27.5 mm against Penicillium spp., Aspergillus spp., Curvularia lunata, Fusarium spp., and several other fungal isolates respectively. The B. subtilis 2B10 and 2C5 exhibit maximum growth inhibition 30 mm and 27.5 mm of P. chrysogenum and Helminthosporium sp., respectively. The present study identified specific characters in the isolated rhizobacteria, which make them good candidates as antagonists and might contribute to plant adaptation to pathogenic microbes. The application of such results in agricultural fields may improve and enhance plant growth in rhizosphere soils.

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