Antagonistic Action of Bacillus subtilis Strain SG6 on Fusarium graminearum

文献类型： 外文期刊

第一作者： Zhao, Yueju

作者： Zhao, Yueju;Selvaraj, Jonathan Nimal;Xing, Fuguo;Zhou, Lu;Wang, Yan;Song, Huimin;Tan, Xinxin;Sun, Lichao;Sangare, Lancine;Folly, Yawa Minnie Elodie;Liu, Yang;Zhao, Yueju;Selvaraj, Jonathan Nimal;Xing, Fuguo;Zhou, Lu;Wang, Yan;Song, Huimin;Tan, Xinxin;Sun, Lichao;Sangare, Lancine;Folly, Yawa Minnie Elodie;Liu, Yang

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2014 年 9 卷 3 期

页码：

收录情况： SCI

摘要： Fusarium graminearum causes Fusarium head blight (FHB), a devastating disease that leads to extensive yield and quality loss of wheat and barley. Bacteria isolated from wheat kernels and plant anthers were screened for antagonistic activity against F. graminearum. Based on its in vitro effectiveness, strain SG6 was selected for characterization and identified as Bacillus subtilis. B. subtilis SG6 exhibited a high antifungal effect on the mycelium growth, sporulation and DON production of F. graminearum with the inhibition rate of 87.9%, 95.6% and 100%, respectively. In order to gain insight into biological control effect in situ, we applied B. subtilis SG6 at anthesis through the soft dough stage of kernel development in field test. It was revealed that B. subtilis SG6 significantly reduced disease incidence (DI), FHB index and DON (P <= 0.05). Further, ultrastructural examination shows that B. subtilis SG6 strain induced stripping of F. graminearum hyphal surface by destroying the cellular structure. When hypha cell wall was damaged, the organelles and cytoplasm inside cell would exude, leading to cell death. The antifungal activity of SG6 could be associated with the coproduction of chitinase, fengycins and surfactins.

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