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Potential Antagonistic Bacteria against Verticillium dahliae Isolated from Artificially Infested Nursery

文献类型： 外文期刊

作者： Su, Xiaofeng 1 ; Wu, Siyuan 1 ; Liu, Lu 1 ; Lu, Guoqing 1 ; Liu, Haiyang 2 ; Jin, Xi 3 ; Wang, Yi 4 ; Guo, Huiming 1 ; Wang, Chen 1 ; Cheng, Hongmei 1 ;

作者机构： 1.Chinese Acad Agr Sci, Biotechnol Res Inst, Beijing 100081, Peoples R China

2.Xinjiang Acad Agr Sci, Inst Plant Protect, Urumqi 830091, Peoples R China

3.Baoding Univ, Hebei Technol Innovat Ctr Green Management Soil B, Baoding 071000, Peoples R China

4.Guizhou Prov Tobacco Corp, Qiannan Branch, Qiannan 550100, Peoples R China

关键词： extracellular enzyme; nonribosomal peptides; cotton; resistant gene expression; biocontrol fungicides

期刊名称：CELLS （ 影响因子：7.666； 五年影响因子：7.677 ）

ISSN：

年卷期： 2021 年 10 卷 12 期

页码：

收录情况： SCI

摘要： As an ecofriendly biocontrol agent, antagonistic bacteria are a crucial class of highly efficient fungicides in the field against Verticillium dahliae, the most virulent pathogen for cotton and other crops. Toward identifying urgently needed bacterial candidates, we screened bacteria isolated from the cotton rhizosphere soil for antagonisitic activity against V. dahliae in an artificially infested nursery. In preliminary tests of antagonistic candidates to characterize the mechanism of action of on culture medium, 88 strains that mainly belonged to Bacillus strongly inhibited the colony diameter of V. dahliae, with inhibiting efficacy up to 50% in 9 strains. Among the most-effective bacterial strains, Bacillus sp. ABLF-18, and ABLF-50 and Paenibacillus sp. ABLF-90 significantly reduced the disease index and fungal biomass of cotton to 40-70% that of the control. In further tests to elucidate the biocontrol mechanism (s), the strains secreted extracellular enzymes cellulase, glucanase, and protease, which can degrade the mycelium, and antimicrobial lipopeptides such as surfactin and iturin homologues. The expression of PAL, MAPK and PR10, genes related to disease resistance, was also elicited in cotton plants. Our results clearly show that three candidate bacterial strains can enhance cotton defense responses against V. dahliae; the secretion of fungal cell-wall-degrading enzymes, synthesis of nonribosomal antimicrobial peptides and induction of systemic resistance shows that the strains have great potential as biocontrol fungicides.

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