A predatory myxobacterium controls cucumber Fusarium wilt by regulating the soil microbial community

文献类型： 外文期刊

第一作者： Ye, Xianfeng

作者： Ye, Xianfeng;Li, Zhoukun;Luo, Xue;Li, Yongkai;Li, Rui;Zhang, Bo;Qiao, Yan;Zhou, Jie;Huang, Yan;Gao, Hui;Cui, Zhongli;Wang, Wenhui;Wang, Hui;Fan, Jiaqin;Cui, Zhongli;Zhang, Ruifu

作者机构：

关键词： Myxobacteria; Micropredator; Corallococcus sp. EGB; Fusarium oxysporum f. sp. cucumerinum; Soil microbiome; Root exudates; Cooccurrence network

期刊名称：MICROBIOME （ 影响因子：14.65； 五年影响因子：15.677 ）

ISSN： 2049-2618

年卷期： 2020 年 8 卷 1 期

页码：

收录情况： SCI

摘要： Background Myxobacteria are micropredators in the soil ecosystem with the capacity to move and feed cooperatively. Some myxobacterial strains have been used to control soil-borne fungal phytopathogens. However, interactions among myxobacteria, plant pathogens, and the soil microbiome are largely unexplored. In this study, we aimed to investigate the behaviors of the myxobacterium Corallococcus sp. strain EGB in the soil and its effect on the soil microbiome after inoculation for controlling cucumber Fusarium wilt caused by Fusarium oxysporum f. sp. cucumerinum (FOC). Results A greenhouse and a 2-year field experiment demonstrated that the solid-state fermented strain EGB significantly reduced the cucumber Fusarium wilt by 79.6% (greenhouse), 66.0% (2015, field), and 53.9% (2016, field). Strain EGB adapted to the soil environment well and decreased the abundance of soil-borne FOC efficiently. Spatiotemporal analysis of the soil microbial community showed that strain EGB migrated towards the roots and root exudates of the cucumber plants via chemotaxis. Cooccurrence network analysis of the soil microbiome indicated a decreased modularity and community number but an increased connection number per node after the application of strain EGB. Several predatory bacteria, such as Lysobacter, Microvirga, and Cupriavidus, appearing as hubs or indicators, showed intensive connections with other bacteria. Conclusion The predatory myxobacterium Corallococcus sp. strain EGB controlled cucumber Fusarium wilt by migrating to the plant root and regulating the soil microbial community. This strain has the potential to be developed as a novel biological control agent of soil-borne Fusarium wilt.

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