巴西固氮螺菌
植物生长
根际细菌
微生物菌剂
镉
植物对草食的防御
化学
生物
植物
细菌
生物化学
遗传学
有机化学
根际
基因
作者
Qingliang Cui,Jingzi Beiyuan,Yinglong Chen,Mengdi Li,Tianyi Qiu,Shuling Zhao,Xiaozhen Zhu,Hansong Chen,Linchuan Fang
标识
DOI:10.1016/j.scitotenv.2024.174503
摘要
Plant growth-promoting rhizobacteria (PGPR) play important roles in plant growth and defense under heavy metal (HM) stress. The direct integration of microbial and plant signals is key to the regulation of plant growth and HM stress defense, but the underlying mechanisms are still limited. Herein, we reveal a novel mechanism by which PGPR regulates plant growth-regulating substances in plant tissues and coordinates plant growth and defense in pak choi under cadmium (Cd) stress. This might be an efficient strategy and an extension of the mechanism by which plant-microbe interactions improve plant stress resistance. Azospirillum brasilense and heme synergistically reduced the shoot Cd content and promoted the growth of pak choi. The interaction between abscisic acid of microbial origin and heme improved Cd stress tolerance through enhancing Cd accumulation in the root cell wall. The interaction between A. brasilense and heme induced the growth–defense shift in plants under Cd stress. Plants sacrifice growth to enhance Cd stress defense, which then transforms into a dual promotion of both growth and defense. This study deepens our understanding of plant-microbe interactions and provides a novel strategy to improve plant growth and defense under HM stress, ensuring future food production and security.
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