基于菌植互作的植物根际细菌钝化镉作用和机制研究进展

土壤重金属镉(Cd)污染严重危害农产品安全生产，植物根际细菌在钝化土壤Cd和帮助作物抵御Cd胁迫方面发挥重要作用。本文首先概括在修复Cd污染土壤中得到广泛应用的植物根际细菌种类，并从根际细菌直接吸附Cd、调整土壤理化特性、调控土壤微生物群落和其他作用4方面阐述了植物根际细菌对Cd的钝化作用，其次从菌植互作角度阐述植物根系分泌物与根际细菌群落相互影响对土壤Cd的钝化作用。最后展望重金属胁迫下植物根际钝化Cd核心菌群的构建，以在新兴学科与技术的快速发展中探明植物根系-微生物互作体系的分子机制，深入开展植物根际细菌钝化修复重金属污染土壤的理论研究和实践。

Role and mechanisms of cadmium passivation by plant rhizosphere bacteria based on bacteria and plants internet: a review

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.