Role of microbes in alleviating abiotic stress in plants

The leading threat to agricultural productivity is the recurrent variations in environmental conditions. A battery of abiotic stresses namely flooding, salinity, temperature, drought, heavy metal toxicities, nutrient deficiencies and oxidative stress causes irreversible damage resulting in loss of plant's vigor and yield. The relationship between plants and microorganisms is a highly dynamic system. The plant microbiome consists of plant growthpromoting bacteria and fungi. In the last decade, many microbes that give hosts the ability to withstand abiotic stress have been characterized in detail. Their beneficial association with plants enables the plant to endure different stresses imposed on them thereby enhancing the plant's sustainability and productivity. For sustainable agriculture, it is very significant to comprehend microbiome-assisted mechanisms for mitigating abiotic stress. This review will shed light on the current knowledge about the roles of various microorganisms in mitigating against abiotic stresses. The understanding of these mechanisms will help to increase the yield of plants and meet the food demands of the expanding population.