Plant Growth-Promoting Rhizobacteria (PGPR): A Rampart against the Adverse Effects of Drought Stress

Abiotic stress significantly limits plant growth and production. Drought, in particular, is a severe constraint that affects agricultural productivity on global scale. Water induces plants set of morpho-anatomical (modification root leaf structure), physiological, biochemical (relative water content, membrane stability, photosynthesis, hormonal balance, antioxidant systems, osmolyte accumulation) changes mainly employed to cope with the drought stress. These strategies allow overcome unfavorable period limited availability. Currently, promising alternative available improve tolerance under conditions. The use osmotolerant growth-promoting rhizobacteria (PGPR) as inoculants can alleviate by increasing efficiency plant. PGPR drought, through morphology architecture system, production phytohormones, extracellular polysaccharides, ACC 1-(aminocyclopropane-1-carboxylate) deaminase, volatile chemicals, accumulation. They may also enhance defense system induce transcriptional regulation response genes. This review addresses effects growth, adaptation, conditions discusses significant potential modulate physiological against scarcity, ensuring survival improving resistance crops.