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Identification of a biocontrol agent Bacillus vallismortis BV23 and assessment of effects of its metabolites on Fusarium graminearum causing corn stalk rot

文献类型： 外文期刊

作者： Li, Yonggang 1 ; Wang, Ruiting 1 ; Liu, Jinxin 1 ; Xu, Lankun 1 ; Ji, Pingsheng 2 ; Sun, Lei 3 ; Pan, Hongyu 4 ; Jiang, B 1 ;

作者机构： 1.Northeast Agr Univ, Agr Coll, Harbin, Heilongjiang, Peoples R China

2.Univ Georgia, Dept Plant Pathol, Coastal Plain Expt Stn, Tifton, GA 31794 USA

3.Heilongjiang Acad Agr Sci, Inst Soil Fertilizer & Environm Resources, Harbin, Heilongjiang, Peoples R China

4.Jilin Univ, Coll Plant Sci, Changchun, Jilin, Peoples R China

5.Northeast Agr Univ, Resources & Environm Coll, Harbin, Heilongjiang, Peoples R China

关键词： Bacillus vallismortis; Fusarium graminearum; corn stalk rot; biological control

期刊名称：BIOCONTROL SCIENCE AND TECHNOLOGY （ 影响因子：1.665； 五年影响因子：1.616 ）

ISSN： 0958-3157

年卷期： 2019 年 29 卷 3 期

页码：

收录情况： SCI

摘要： Corn stalk rot, caused by Fusarium graminearum, is one of the most destructive diseases of maize in many regions of the world. A bacterial strain BV23 was isolated from corn rhizosphere that reduced corn stalk rot significantly in greenhouse studies in 2016 and 2017. BV23 was identified as Bacillus vallismortis, which showed antagonistic effects against a number of fungal pathogens, including F. graminearum, Rhizoctonia solani, Athelia rolfsii, and Thanatephorus cucumeris. BV23 had the greatest fungistatic effect on F. graminearum, inhibiting mycelial growth by 66.2%, conidial germination by 90.1%, and conidial production by 86.7%. The probable antifungal mechanism was assessed by examining the morphology and ultrastructure of F. graminearum hyphae. Treatment by BV23 culture supernatant resulted in coarser hyphae, induced cytoplasmic granulation, and increased cell membrane permeability of F. graminearum, causing cytoplasm leakage. These effects became increasingly obvious with increasing concentration (1%, 5% and 10%). Furthermore, the antifungal active substances were sensitive to heat.

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