Plant-Microbe Interactions in Alleviating Abiotic Stress—A Mini Review

Michael Prabhu Inbaraj

doi:10.3389/fagro.2021.667903

Abstract

Crop plants are continuously exposed to various abiotic stresses like drought, salinity, ultraviolet radiation, low and high temperatures, flooding, metal toxicities, nutrient deficiencies which act as limiting factors that hampers plant growth and low agricultural productivity. Climate change and intensive agricultural practices has further aggravated the impact of abiotic stresses leading to a substantial crop loss worldwide. Crop plants have to get acclimatized to various environmental abiotic stress factors. Though genetic engineering is applied to improve plants tolerance to abiotic stresses, these are long-term strategies, and many countries have not accepted them worldwide. Therefore, use of microbes can be an economical and ecofriendly tool to avoid the shortcomings of other strategies. The microbial community in close proximity to the plant roots is so diverse in nature and can play an important role in mitigating the abiotic stresses. Plant-associated microorganisms, such as endophytes, arbuscular mycorrhizal fungi (AMF), and plant growth-promoting rhizobacteria (PGPR), are well-documented for their role in promoting crop productivity and providing stress tolerance. This mini review highlights and discusses the current knowledge on the role of various microbes and it's tolerance mechanisms which helps the crop plants to mitigate and tolerate varied abiotic stresses.

Highlights

Agriculture is one among the most important essential sectors which is of utmost susceptible to global climate changes
Due to the global climate change accompanied with the other abiotic stresses there will be a decline in the production of major cereal crops (20–45% in maize yields, 5–50% in wheat, and 20–30% in rice) by the year 2100
The various abiotic stresses pose a major threat to world food security by exerting their deleterious effects on the crop growth, physiological and biochemical plant functions, and affecting the crop yield

Summary

Introduction

Agriculture is one among the most important essential sectors which is of utmost susceptible to global climate changes. Symbiotic association of AMF helps the host plants to overcome various environmental stress conditions like pathogens, acidity, desiccation, and heavy metal toxicity by enhanced photosynthetic rate, water and nutrient uptake and leaf gas exchange (Zuccaro et al, 2009; Sun et al, 2018).

Results

Conclusion