A Newly IsolatedStreptomycessp. YYS-7 With a Broad-Spectrum Antifungal Activity Improves the Banana Plant Resistance toFusarium oxysporumf. sp.cubenseTropical Race 4

文献类型： 外文期刊

第一作者： Wei, Yuanyuan

作者： Wei, Yuanyuan;Zhao, Yankun;Zhou, Dengbo;Qi, Dengfeng;Li, Kai;Tang, Wen;Chen, Yufeng;Xie, Jianghui;Wang, Wei;Wei, Yuanyuan;Jing, Tao;Zang, Xiaoping

作者机构：

关键词： Streptomyces; fusarium wilt of banana; antifungal activity; GC-MS; biocontrol

期刊名称：FRONTIERS IN MICROBIOLOGY （ 影响因子：5.64； 五年影响因子：6.32 ）

ISSN： 1664-302X

年卷期： 2020 年 11 卷

页码：

收录情况： SCI

摘要： Fusarium wilt of banana caused byFusarium oxysporumf. sp.cubense(Foc) is one of the most destructive diseases, severely limiting the development of banana industry. Especially, Foc tropical race 4 (Foc TR4) can infect and destroy almost all banana cultivars. Until now, there is still a lack of an effective method for controlling fusarium wilt. A biocontrol strategy using Actinobacteria is considered as a promising method for management of disease and pest. In this study, 229 Actinobacteria were isolated from rhizosphere soil samples of a primitive ecological mountain. An actinobacterium strain marked with YYS-7 exhibited a high antifungal activity against Foc TR4. Combining the physiological and biochemical characteristics as well as alignment of the 16SrRNAsequence, the strain YYS-7 was assigned toStreptomycessp. The crude extracts ofStreptomycessp. YYS-7 obviously inhibited the mycelial growth of Foc TR4. The cell integrity and ultrastructure were seriously destroyed. In addition,Streptomycessp. YYS-7 and crude extracts also showed a broad-spectrum antifungal activity against the selected seven phytopathogenic fungi. A gas chromatography-mass spectrometry (GC-MS) was used to predict the antifungal metabolites. A total of eleven different compounds were identified, including phenolic compounds, hydrocarbons, esters and acids. In the pot experiment, the crude extracts can significantly improve the banana plant's resistance to Foc TR4. Hence,Streptomycessp. YYS-7 will be a potential biocontrol agent for the biofertilizer exploitation and the discovery of new bioactive substances.

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