Iturins produced by Bacillus velezensis Jt84 play a key role in the biocontrol of rice blast disease

文献类型： 外文期刊

第一作者： Zhang, Rong-Sheng

作者： Zhang, Rong-Sheng;Wang, Fa-Guo;Qi, Zhong-Qiang;Qiao, Jun-Qing;Du, Yan;Yu, Jun-Jie;Yu, Mi-Na;Liang, Dong;Song, Tian-Qiao;Yan, Pan-Xia;Cao, Hui -Juan;Zhang, Hao;Liu, Yong-Feng

作者机构：

关键词： Bacillus velezensis; Lipopeptides; Iturins; M. oryzae

期刊名称：BIOLOGICAL CONTROL （ 影响因子：3.857； 五年影响因子：4.141 ）

ISSN： 1049-9644

年卷期： 2022 年 174 卷

页码：

收录情况： SCI

摘要： Rice blast disease, caused by the plant pathogenic fungus Magnaporthe oryzae, severely constrains rice production worldwide. Using plant-associated microorganisms, biological control of rice blast is an efficient and environ-mentally friendly approach to disease management. Bacillus bacteria produce a broad array of antifungal lip-opeptides, making them effective biological control agents. In a previous study, Bacillus velezensis strain Jt84 exhibited biocontrol activity against rice blast disease, and the antifungal compounds it produces were isolated by acid precipitation of cell-free supernatants extracted with methanol were lipopeptides. Lipopeptides showed a stronger inhibitory effect against M. oryzae and induced abnormal mycelial morphology. Further analysis using PCR and HPLC-ESI-MS confirmed the presence of surfactins, iturins, and fengycins. The results exhibited that iturins play an essential role in the antifungal activity against M. oryzae and confirmed these results through mutagenesis experiments used to suppress iturins biosynthesis. In conclusion, B. velezensis Jt84 significantly reduced the incidence of rice blast disease at the seedling stage, while B. velezensis Jt84 & UDelta;ituB strain markedly reduced disease biocontrol effect, indicated that iturins produced by B. velezensis Jt84 strain play a key role in the biocontrol of rice blast disease.

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