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Mechanisms of Surfactin from Bacillus subtilis SF1 against Fusarium foetens: A Novel Pathogen Inducing Potato Wilt

文献类型： 外文期刊

作者： Liu, Lin 1 ; Jin, Xiaofan 1 ; Lu, Xiuhua 1 ; Guo, Lizhong 1 ; Lu, Peiwei 2 ; Yu, Hao 1 ; Lv, Beibei 3 ;

作者机构： 1.Qingdao Agr Univ, Coll Life Sci, Shandong Prov Key Lab Appl Mycol, Qingdao 266109, Peoples R China

2.Bayer Crop Sci China Co Ltd, Hangzhou 310018, Peoples R China

3.Shanghai Acad Agr Sci, Biotechnol Res Inst, Key Lab Agr Genet & Breeding, Shanghai 201106, Peoples R China

关键词： biocontrol; Fusarium wilt; antifungal mechanism; cell membrane permeability; protein expression differential; DNA binding

期刊名称：JOURNAL OF FUNGI （ 影响因子：4.7； 五年影响因子：5.2 ）

ISSN：

年卷期： 2023 年 9 卷 3 期

页码：

收录情况： SCI

摘要： Fusarium wilt is a severe and worldwide disease in potato cultivation. In this study, Fusarium foetens was first identified as the pathogen of potato wilt. Bacillus subtilis SF1 has the potential for controlling potato wilt induced by F. foetens, resulting in a mycelium growth inhibition of 52.50 +/- 2.59% in vitro and a significant decrease in incidence rate by 45.56% in vivo. This research highlighted the antifungal activity of surfactin from B. subtilis SF1 and attempted to reveal the unknown antifungal mechanisms. Surfactin inhibited F. foetens mycelium growth beyond the concentration of 20 mu g/mu L. Surfactin-treated mycelium appeared to have morphological malformation. Surfactin enhanced reduced glutathione production and caused the increase in values of the extracellular fluids in OD260 and OD280. Surfactin induced differential protein expression and changed the genes' transcription levels. Surfactin binds to fungal DNA via groove-binding mode, with a binding constant of Kb 2.97 +/- 104 M 1. Moreover, B. subtilis SF1 harbored genes encoding plant-promoting determinants, making potato seedlings grow vigorously. The results will help provide a comprehensive understanding of the mechanisms of surfactin against filamentous fungi and the application of surfactin-producing microbial in the biocontrol of plant pathogenic fungi.

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