Swarming motility plays the major role in migration during tomato root colonization by Bacillus subtilis SWR01

文献类型： 外文期刊

第一作者： Gao, Shengfeng

作者： Gao, Shengfeng;Wu, Huijun;Yu, Xinfang;Qian, Limin;Gao, Xuewen;Gao, Shengfeng

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关键词： Root colonization;Bacillus subtilis SWR01;Swarming;Chemotaxis;Flagella motility

期刊名称：BIOLOGICAL CONTROL （ 影响因子：3.687； 五年影响因子：3.962 ）

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收录情况： SCI

摘要： Root colonization is important for the application of Plant Growth-Promoting Rhizobacteria (PGPR). Previously, chemotaxis was believed to be the major trait for colonization. However, because chemotaxis defective mutants are usually swarming impaired at the same time, in this study we clarified the roles played by swarming motility and chemotaxis in tomato root colonization by Bacillus subtilis SWR01. Tomato seeds were treated with B. subtilis SWR01 or mutants before being sown in Simons' gnotobiotic system, and the colonization efficacy at root tips were observed after 2 weeks. Both microscopy and plate counts showed that the colonization efficacy of swarming defective and chemotaxis proficient mutants (Delta swrA, Delta minJ and Delta srfAC) was about 5%-15% that of the parental strain SWR01, while the colonization efficacy of the swarming normal and chemotaxis impaired mutant Delta cheV was 78.9% that of the wild-type bacteria. These results demonstrate that while both chemotaxis and swarming motility are important in root colonization, and the role played by swarming is greater than that of chemotaxis. In addition, non-flagellated mutants (Delta hag) showed 0.47% colonization efficacy relative to that of B. subtilis SWR01, suggesting more than 99% root colonization requires the presence of flagella. This study indicates new ways to enhance PGPR rhizoplane colonization, which is useful in agricultural applications. (C) 2016 Elsevier Inc. All rights reserved.

分类号： S476`Q81.3`S4

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