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Characterization of the Endophytic Bacillus subtilis KRS015 Strain for Its Biocontrol Efficacy Against Verticillium dahliae

文献类型： 外文期刊

作者： Song, Jian 1 ; Wang, Dan 1 ; Han, Dongfei 2 ; Zhang, Dan-Dan 1 ; Li, Ran 1 ; Kong, Zhi-Qiang 1 ; Dai, Xiao-Feng 1 ; Subbarao, Krishna V. 4 ; Chen, Jie-Yin 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Plant Protect, State Key Lab Biol Plant Dis & Insect Pests, Beijing 100193, Peoples R China

2.Suzhou Univ Sci & Technol, Sch Environm Sci & Engn, Suzhou 215009, Peoples R China

3.Chinese Acad Agr Sci, Western Agr Res Ctr, Changji 831100, Peoples R China

4.Univ Calif Davis, US Agr Res Stn, Dept Plant Pathol, Salinas, CA 93905 USA

关键词： Bacillus subtilis; biological control; plant growth promotion; plant immunity; Verticillium dahliae; Verticillium wilt

期刊名称：PHYTOPATHOLOGY （ 影响因子：3.2； 五年影响因子：3.9 ）

ISSN： 0031-949X

年卷期： 2024 年 114 卷 1 期

页码：

收录情况： SCI

摘要： Endophytes play important roles in promoting plant growth and controlling plant diseases. Verticillium wilt is a vascular wilt disease caused by Verticillium dahliae, a widely distributed soilborne pathogen that causes significant economic losses on cotton each year. In this study, an endophyte KRS015, isolated from the seed of the Verticillium wilt-resistant Gossypium hirsutum 'Zhongzhimian No. 2', was identified as Bacillus subtilis by morphological, phylogenetic, physiological, and biochemical analyses. The volatile organic compounds (VOCs) produced by KRS015 or its cell-free fermentation extract had significant antagonistic effects on various pathogenic fungi, including V. dahliae. KRS015 reduced Verticillium wilt index and colonization of V. dahliae in treated cotton seedlings significantly; the disease reduction rate was similar to 62%. KRS015 also promoted plant growth, potentially mediated by the growth-related cotton genes GhACL5 and GhCPD-3. The cell-free fermentation extract of KRS015 triggered a hypersensitivity response, including reactive oxygen species (ROS) and expression of resistance-related plant genes. VOCs from KRS015 also inhibited germination of conidia and the mycelial growth of V. dahliae, and were mediated by growth and development-related genes such as VdHapX, VdMcm1, Vdpf, and Vel1. These results suggest that KRS015 is a potential agent for controlling Verticillium wilt and promoting growth of cotton.

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