Annals of Microbiology

, Volume 66, Issue 1, pp 35–42 | Cite as

Plant-growth-promoting rhizobacteria: drought stress alleviators to ameliorate crop production in drylands

Review Article

Abstract

Drylands are known for being a drought stressed environment, which is an alarming constraint to crop productivity. To rescue plant growth in such stressful conditions, plant-growth-promoting rhizobacteria (PGPR) are a bulwark against drought stress and imperilled sustainability of agriculture in drylands. PGPR mitigates the impact of drought stress on plants through a process called rhizobacterial-induced drought endurance and resilience (RIDER), which includes physiological and biochemical changes. Various RIDER mechanisms include modification in phytohormonal levels, antioxidant defense, bacterial exopolysaccharides (EPS), and those associated with metabolic adjustments encompass accumulation of several compatible organic solutes like sugars, amino acids and polyamines. Production of heat-shock proteins (HSPs), dehydrins and volatile organic compounds (VOCs) also plays significant role in the acquisition of drought tolerance. Selection, screening and application of drought-stress-tolerant PGPRs to crops can help to overcome productivity limits in drylands.

Keywords

Drought stress PGPR LapA EPS VOCs RIDER 

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Copyright information

© Springer-Verlag Berlin Heidelberg and the University of Milan 2015

Authors and Affiliations

  1. 1.Resilient Dryland SystemsInternational Crops Research Institute for the Semi-Arid Tropics (ICRISAT)HyderabadIndia

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