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Bacillus velezensis BM21, a potential and efficient biocontrol agent in control of corn stalk rot caused by Fusarium graminearum

文献类型： 外文期刊

作者： Wang, Shuang 1 ; Sun, Lei 1 ; Zhang, Wu 2 ; Chi, Fengqin 1 ; Hao, Xiaoyu 1 ; Bian, Jingyang 3 ; Li, Yonggang 4 ;

作者机构： 1.Heilongjiang Acad Agr Sci, Inst Soil Fertilizer & Environm Resources,Minist, Sci Observing & Expt Stn Heilongjiang Farmland Co, Key Lab Soil Environm & Plant Nutr Heilongjiang P, Harbin 150086, Peoples R China

2.Heilongjiang Acad Agr Sci, Heihe Branch, Heihe 164300, Heilongjiang, Peoples R China

3.Heilongjiang Acad Agr Sci, Daqing Branch, Daqing 163000, Peoples R China

4.Northeast Agr Univ, Agr Coll, Harbin 150030, Peoples R China

关键词： Corn stalk rot; Fusarium graminearum; Bacillus velezensis; Biological control; Antifungal mechanism

期刊名称：EGYPTIAN JOURNAL OF BIOLOGICAL PEST CONTROL （ 影响因子：1.995； 五年影响因子：1.115 ）

ISSN： 1110-1768

年卷期： 2020 年 30 卷 1 期

页码：

收录情况： SCI

摘要： The present work was conducted to screen and identify biocontrol bacteria that effectively reduce the severity of corn stalk rot (CSR) and clarify the antifungal activity of secondary metabolites. The bacterial strain (BM21) was isolated from corn rhizosphere soil that effectively reduced CSR in pot experiments. On the basis of phylogenetic reconstructions, 16S rRNA sequence analysis, and biochemical and physiological reactions, BM21 was identified as Bacillus velezensis. The strain exhibited remarkable antifungal activity against Fusarium graminearum, a pathogenic fungus that causes CSR. Extracellular antifungal substances (10%) isolated from BM21 inhibited F. graminearum mycelial growth by 79.2%, conidial germination by 84.0%, and conidial production by 78.1%. In addition, the extracellular antifungal substances caused mycelial malformation and ultra-structural changes. The extracellular antifungal substances were sensitive to heat and showed a degree of resistance to ultraviolet radiation. The optimum pH for antifungal activity was 6-8. In pot experiments, irrigation with aqueous extracts from BM21 (1.0 mL/plant) reduced CSR incidence by 72.4-77.4%. B. velezensis BM21 effectively reduced CSR incidence and showed a potential as a biocontrol agent to control CSR.

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