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Microbiome Under Changing Climate
2022, 115-141

Contribution of agriculturally important microbes in potentiating the crops to cope with climatic changes

Bhupendra Koul1, Manpriya Chopra1, Rahul Singh2

Department of Biotechnology, School of Bioengineering and Biosciences, Lovely Professional University, Phagwara, India.


Plant growth and productivity in an agricultural field depends upon both the biotic (pathogens, pests, wounding, anthropogenic activities, etc.) and abiotic interactions (light, herbicides, wind, drought, flood, temperature, salinity, heavy metals, etc.). In stress conditions the reactive oxygen species harm the plant and retard its growth by oxidizing the proteins, membrane lipids, nucleic acids, and photosynthetic pigments. Both plant growth–promoting rhizobacteria (PGPR) and mycorrhizal fungi promote the growth and productivity of crops during various stresses. The PGPRs can be classified as extracellular PGPR and intercellular PGPR. They exhibit direct and indirect mechanisms to stimulate plant growth. Direct mechanisms are phosphate and potassium solubilization, siderophore, phytohormone and exopolysaccharide production, nitrogen fixation, and rhizoremediation, while the indirect mechanisms are the production of volatile organic compounds, protective enzymes and antistress metabolites, induced systemic resistance, antibiosis, etc. Several species of RhizobiumBradyrhizobiumPseudomonasBacillusPaenibacillusArthrobacter, etc. fall under the category of PGPR. The mycorrhizal fungi (arbuscular fungi) also increase the nutrient and water supply to plant and increase their tolerance to stress. Meticulous and comprehensive researches on deciphering the mechanism of agriculturally important microbes to cope with climatic changes shall prove to be a boon for sustainable agriculture.

Keywords: Rhizobacteria, rhizosphere, PGPR, abiotic stress, biotic stress.

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