Diversity and chemotaxis of soil bacteria with antifungal activity against Fusarium wilt of banana

文献类型： 外文期刊

第一作者： Li, Ping

作者： Li, Ping;Ma, Li;Feng, Yun Li;Mo, Ming He;Li, Ping;Ma, Li;Feng, Yun Li;Mo, Ming He;Yang, Fa Xiang;Dai, Hao Fu;Zhao, You Xing

作者机构：

关键词： Fusarium oxysporum f. sp cubense;Banana;Biological control bacteria;Chemotaxis;Root exudates

期刊名称：JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY （ 影响因子：3.346； 五年影响因子：3.426 ）

ISSN： 1367-5435

年卷期： 2012 年 39 卷 10 期

页码：

收录情况： SCI

摘要： The chemotactic response of bacteria to root exudates plays an important role in the colonization of bacteria in the rhizosphere. In this study, 420 strains of antifungal bacteria against Fusarium oxysporum f. sp. cubense (Foc) were screened for chemotaxis based on a cheA molecular diagnostic method. A total of 124 strains with antifungal efficiencies of 27.26-67.14 % generated a characteristic band of cheA. The chemotaxis of 97 bacterial strains producing a cheA band was confirmed using the drop assay and swarm plate assay using catechol, p-hydroxybenzoic acid, salicylic acid, and asparagine as the attractants. A phylogenetic analysis based on restriction fragment length polymorphisms (RFLPs) and 16S rDNA sequences indicated that the 124 chemotactic antagonists of Foc were affiliated with 18 species of Paenibacillaceae, Bacillaceae, Streptomycineae, Enterobacteriaceae, and Pseudomonadaceae. The chemical composition of banana root exudates were analyzed by GC-MS, and 62 compounds, including alkanes, alkenes, naphthalenes, benzenes, and alcohols, were evaluated. Five representative antagonists of Foc showed 1.76- to 7.75-fold higher chemotactic responses than the control to seven compounds in banana root exudates, as determination by capillary assays.

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