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Biocontrol potential and mechanism of Bacillus velezensis YMG-03 for sesame diseases

文献类型： 外文期刊

作者： Yang, Huaituo 1 ; He, Bipo 1 ; Zhao, Xinbei 1 ; Yan, Wenqing 1 ; Wang, Jing 1 ; Zhao, Hui 1 ; Ni, Yunxia 1 ; Liu, Hongyan 1 ; Ma, Chao 2 ;

作者机构： 1.Henan Acad Agr Sci, Inst Plant Protect, 116 Huayuan Rd, Zhengzhou 450002, Henan, Peoples R China

2.Guiyang Univ, Coll Mat Sci & Engn, Guiyang 550000, Peoples R China

3.Henan Key Lab Agr Pest Monitoring & Control, Zhengzhou, Peoples R China

4.Minist Agr & Rural Affairs, Key Lab Integrated Crop Pests Management Crops Sou, Beijing, Peoples R China

5.Biopesticide Engn Res Ctr Henan Prov, Wuhan, Peoples R China

关键词： Sesame stem blight; Genome; Secondary metabolite

期刊名称：PHYSIOLOGICAL AND MOLECULAR PLANT PATHOLOGY （ 影响因子：3.3； 五年影响因子：3.2 ）

ISSN： 0885-5765

年卷期： 2025 年 140 卷

页码：

收录情况： SCI

摘要： Sesame, a globally important oilseed crop, faces significant threats from fungal diseases, leading to substantial yield and quality losses. Utilizing antagonistic bacteria for biological control offers a sustainable and environmentally friendly alternative to chemical fungicides in sustainable agriculture. This study investigated the control effects and mechanisms of the Bacillus velezensis strain YMG-03 against sesame diseases. In dual-culture comparison assays, YMG-03 broadly inhibited eight major sesame pathogens, achieving 83.73% suppression against Macrophomina phaseolina, causing sesame stem blight. Scanning electron microscopy revealed severe morphological disruption of M. phaseolina hyphae following a dual-culture comparison assay with strain YMG-03. Pot experiments demonstrated that YMG-03 significantly suppressed stem blight disease and enhanced sesame growth. Genome analysis of strain YMG-03 revealed a 3.93 Mb circular chromosome containing 12 secondary metabolite biosynthetic gene clusters (e.g., surfactin, fengycin, bacillibactin) and genes encoding hydrolytic enzymes (e.g., chitinase, cellulase), indicating its genetic potential for antagonistic metabolite and hydrolases production. Untargeted metabolomics identified 1413 up-regulated metabolites, among which lipids (e.g., liquiritigenin, jasmonic acid, capsaicin), organic acids (e.g., 6-aminopenicillanic acid, piperic acid, coumaric acid), and key precursors for biocontrol metabolites (3-hydroxy fatty acids, N-acetylglucosamine, Lleucine) significantly accumulated. KEGG enrichment analysis revealed their association with fatty acid metabolism, polyketide/terpenoid biosynthesis, and amino sugar metabolism, consistent with the predicted antagonistic functions from genomic data. These findings systematically elucidate the dual role of B. velezensis YMG-03 in synergistically promoting sesame growth and controlling stem blight, and provide both strain resources and theoretical foundations for applying B. velezensis in biological control.

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