Potential of <i>Bacillus halotolerans</i> in Mitigating Biotic and Abiotic Stresses: A Comprehensive Review

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Abstract

Bacillus halotolerans, a halophilic bacterial species of the genus Bacillus, is emerging as a biological control agent with immense potential for sustainable agriculture, particularly in extreme conditions and environmental rehabilitation. This review summarizes the current state of research on B. halotolerans, emphasizing its diverse applications in the biocontrol of plant pathogens, plant growth promotion under salinity stress, nematode management, and bioremediation. B. halotolerans utilizes several mechanisms such as the production of siderophores and phytohormones, secretion of exopolysaccharides, and the release of antifungal and nematicidal compounds, which allows it to mitigate both abiotic and biotic stresses in various crops, including wheat, rice, date palm, tomato, and others. In addition, genomic and metabolomic analyses have revealed its potential for secondary metabolite production that improves its antagonistic and growth-promoting traits. Despite significant progress, challenges remain in translating laboratory results into field applications. Future research should focus on formulating effective bioinoculants and field trials, to maximize the practical utility of B. halotolerans for sustainable agriculture and environmental resilience.

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