Soil microbial legacy mediated by buckwheat flavonoids enhances cabbage resistance to clubroot disease

作者：Jiabing Wu, S. L. Hu, Jing Chen, Lili Zhou, Shengdie Yang, Na Zhou, Lei Wu, Guoqing Niu, Yong Zhang, Xuesong Ren, Qinfei Li, Jun Yuan, Hongyuan Song, Si Jun · 发表于：Microbiome · 年份：2025 · DOI：10.1186/s40168-025-02166-y · 被引用次数：17 · 研究领域：Plant Disease Resistance and Genetics、Plant-Microbe Interactions and Immunity、Plant Disease Management Techniques

BACKGROUND: The legacy of plant growth significantly impacts the health of subsequent plants, yet the mechanisms by which soil legacies in crop rotation systems influence disease resistance through rhizosphere plant-microbiome interactions remain unclear. Using a buckwheat-cabbage rotation model, we investigated how microbial soil legacies shape cabbage growth and clubroot disease resistance. RESULTS: Three-year field trials revealed that buckwheat rotation sustainably reduced clubroot severity by 67%-97%, regardless of pathogen load. Soil sterilization eliminated this suppression, implicating a microbial basis. Using 16S rRNA sequencing, we identified buckwheat-enriched bacterial taxa (Microbacterium, Stenotrophomonas, Ralstonia) that colonized subsequent cabbage roots. Metabolomic profiling pinpointed buckwheat root-secreted flavonoids - 6,7,4'-trihydroxyisoflavone and 7,3',4'-trihydroxyflavone - as key drivers of microbial community restructuring. These flavonoids synergistically enhanced the efficacy of a synthetic microbial community (SynCom1, containing Microbacterium keratanolyticum, Stenotrophomonas maltophilia, and Ralstonia pickettii), boosting disease suppression by 34% in greenhouse trials. Co-application of flavonoids and SynCom1 improved bacterial colonization in root niches. Although SynCom1 partially activated jasmonic acid (JA)-associated defenses, its effectiveness depended primarily on flavonoid-driven microbial recruitment rather than direct immune inducti...