Plant commensal type VII secretion system causes iron leakage from roots to promote colonization

文献类型： 外文期刊

第一作者： Liu, Yunpeng

作者： Liu, Yunpeng;Shu, Xia;Sun, Xiting;Xiong, Qin;Li, Guangqi;Zhang, Ruifu;Shu, Xia;Zhang, Huihui;Feng, Haichao;Xun, Weibing;Xu, Zhihui;Zhang, Nan;Shen, Qirong;Zhang, Ruifu;Shu, Xia;Chen, Lin;Pieterse, Corne M. J.

作者机构：

期刊名称：NATURE MICROBIOLOGY （ 影响因子：28.3； 五年影响因子：22.9 ）

ISSN： 2058-5276

年卷期： 2023 年 8 卷 8 期

页码：

收录情况： SCI

摘要： Competition for iron is an important factor for microbial niche establishment in the rhizosphere. Pathogenic and beneficial symbiotic bacteria use various secretion systems to interact with their hosts and acquire limited resources from the environment. Bacillus spp. are important plant commensals that encode a type VII secretion system (T7SS). However, the function of this secretion system in rhizobacteria-plant interactions is unclear. Here we use the beneficial rhizobacterium Bacillus velezensis SQR9 to show that the T7SS and the major secreted protein YukE are critical for root colonization. In planta experiments and liposome-based experiments demonstrate that secreted YukE inserts into the plant plasma membrane and causes root iron leakage in the early stage of inoculation. The increased availability of iron promotes root colonization by SQR9. Overall, our work reveals a previously undescribed role of the T7SS in a beneficial rhizobacterium to promote colonization and thus plant-microbe interactions. The plant commensal Bacillus velezensis SQR9 uses its type VII secretion system to deliver effector protein YukE to plant roots, which causes iron leakage and promotes its colonization on roots.

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