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In Indian economy, agriculture is the main backbone, which either directly or indirectly provides livelihood to approximately 70% of the country population. Therefore growth in the agricultural sector is essential for the growth and development of the country (Nerker et al., 2013). However, due to global climatic changes, environment typically meets a large number of single and combination of abiotic and biotic stresses, which severely Due to climate change, abiotic and biotic stresses like soil salinity, drought, pH, high temperature and plant fungal diseases are major threat for agriculture production and which reduces the growing demand of food of the population. To cope the adverse effect of such stresses, use of wide variety of synthetic chemical fertilizers cause serious hazardous effects on environment, soil, water and human health. Use of microorganisms as a bioinoculants is a new green eco-friendly technology for sustainable agriculture production and can lessen the effect of these stresses. With this respect in the present study a dominant bacterial strain AH53 was isolated from barren agriculture soil of Uttar Pradesh, India for exploiting its unique plant growth promotion properties, tolerance to abiotic stresses, as well as antifungal activities against the fungal pathogens. The results of different level of abiotic stresses tolerance showed that strain AH53 was able to grow up to 14% NaCl, 30% PEG, between 20 to 50°C temperature and 5–9 pH. Further dual culture assay revealed that strain AH53 significantly inhibited mycelial growth of Sclerotium rolfsii and Fusarium avenaceum with the inhibition rate of 86.59 and 85.15% respectively. The different mode of action for abiotic stresses tolerance and biocontrol activity of the strain AH53 was confirmed by production of multiple plant growth promoting and biocontrol determinants like production of indole acetic acid (125.24 ug/ml), siderophore, HCN, ACC deaminase, solubilization of phosphate – zinc, production of hydrolytic enzymes and PCR amplification of antimicrobial peptides genes. The 16S rRNA gene sequencing and phylogenetic analysis identified the strain as Bacillus amyloliquefaciens. The results provide evidence that strain AH53 may contribute to its potential activity as mitigation of abiotic stresses and biological control of plants disease to enhancement of sustainable agriculture production under different stressful condition. K e y w o r d s

international journal of current microbiology and applied sciences

Exploitation of Multifarious Abiotic Stresses, Antagonistic Activity and Plant Growth Promoting Attributes of Bacillus amyloliquefaciens AH53 for Sustainable Agriculture Production