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Crop productivity is affected by environmental and genetic factors. Microbes that are beneficial to plants are used to enhance the crop yield and are alternatives to chemical fertilizers and pesticides.  Pseudomonas  and  Bacillus  species are the predominant plant growth-promoting bacteria. The spore-forming ability of  Bacillus  is distinguished from that of  Pseudomonas . Members of this genus also survive for a long time under unfavorable environmental conditions.  Bacillus  spp. secrete several metabolites that trigger plant growth and prevent pathogen infection. Limited studies have been conducted to understand the physiological changes that occur in crops in response to  Bacillus  spp. to provide protection against adverse environmental conditions. This review describes the current understanding of  Bacillus -induced physiological changes in plants as an adaptation to abiotic and biotic stresses. During water scarcity, salinity and heavy metal accumulate in soil,  Bacillus  spp. produce exopolysaccharides and siderophores, which prevent the movement of toxic ions and adjust the ionic balance and water transport in plant tissues while controlling the pathogenic microbial population. In addition, the synthesis of indole-3-acetic acid, gibberellic acid and1-aminocyclopropane-1-carboxylate (ACC) deaminase by  Bacillus  regulates the intracellular phytohormone metabolism and increases plant stress tolerance. Cell-wall-degrading substances, such as chitosanase, protease, cellulase, glucanase, lipopeptides and hydrogen cyanide from  Bacillus  spp. damage the pathogenic bacteria, fungi, nematodes, viruses and pests to control their populations in plants and agricultural lands. The normal plant metabolism is affected by unfavorable environmental stimuli, which suppress crop growth and yield. Abiotic and biotic stress factors that have detrimental effects on crops are mitigated by  Bacillus -induced physiological changes, including the regulation of water transport, nutrient up-take and the activation of the antioxidant and defense systems.  Bacillus  association stimulates plant immunity against stresses by altering stress-responsive genes, proteins, phytohormones and related metabolites. This review describes the beneficial effect of  Bacillus  spp. on crop plants, which improves plant productivity under unfavorable climatic conditions, and the current understanding of the mitigation mechanism of  Bacillus  spp. in stress-tolerant and/or stress-resistant plants.

Bacillus: A Biological Tool for Crop Improvement through Bio-Molecular Changes in Adverse Environments