Abstract:Soil cadmium pollution seriously endangers the safe production of agricultural products, while plant rhizosphere bacteria play a critical role in passivating cadmium in soil and helping crops resist cadmium stress. This paper firstly summarizes the species of rhizosphere bacteria used widely in the remediation of cadmium-contaminated soils and elaborates on the mechanisms of cadmium passivation by plant rhizosphere bacteria from four aspects: direct adsorption of cadmium by rhizosphere bacteria, adjustment of soil physical and chemical characteristics, regulation of rhizosphere bacterial community and other effects. Secondly, from the perspective of bacterium-plant interaction, we expound the effects of the interactions between plant root exudates and rhizosphere bacterial community changes on soil cadmium passivation. Finally, we prospect the core flora assembly of plant rhizosphere bacteria for passivating cadmium under heavy metal stress. With this review, we aim to explore the molecular mechanism of plant root-microorganism interaction system in the context of emerging disciplines and advancing technologies and facilitate the in-depth theoretical research and practice on the remediation of heavy metal-contaminated soil by rhizosphere bacterial passivation.
