Rhizobacteria Containing ACC Deaminase Enhance Plant Growth and Tolerance Under Abiotic Stress Conditions

Various abiotic stresses affect plants in the environment, and the impact may be impaired by global climate change soon. Plants produce ethylene in response to almost all environmental stresses, which is detrimental to the viability of the plant. Thus, controlling the production of stress ethylene in plants is emerging as an intriguing approach to boost crop production and mitigate the unwanted effects of abiotic stressors. Plants use 1-Aminocyclopropane-1-carboxylic acid (ACC) as a precursor to produce ethylene. It is well known that rhizobacteria that promote plant growth and have ACC deaminase activity can regulate plant growth in extreme conditions by lowering the levels of stress ethylene in plants. Researchers suggest that rhizobacteria that produce ACC deaminase can help plant development under varying environmental conditions, and bacteria with ACC deaminase could play a pivotal role in conferring tolerance and adaptation in plants to various abiotic stressors, indicating their great potential in addition to microbial plant biostimulants. In the present study, we aimed to describe the mechanism of ACC deaminase-producing rhizobacteria in plant growth promotion and tolerance to abiotic stress.