Screening and Application of Bacillus Strains Isolated from Nonrhizospheric Rice Soil for the Biocontrol of Rice Blast
文献类型： 外文期刊
作者： Sha, Yuexia 1 ; Zeng, Qingchao 2 ; Sui, Shuting 2 ;
作者机构： 1.Ningxia Acad Agr & Forestry Sci, Inst Plant Protect, Yinchuan 750011, Ningxia, Peoples R China
2.China Agr Univ, Coll Plant Protect, Beijing 100193, Peoples R China
关键词： Bacillus; biocontrol; nonrhizospheric rice soil; rice blast; screening
期刊名称：PLANT PATHOLOGY JOURNAL （ 影响因子：1.795； 五年影响因子：2.314 ）
ISSN： 1598-2254
年卷期： 2020 年 36 卷 3 期
页码：
收录情况： SCI
摘要： Rice blast, caused by Magnaporthe oryzae, is one of the most destructive rice diseases worldwide. The aim of this study was to screen bacterial isolates to efficiently prevent the occurrence of rice blast. A total of 232 bacterial isolates were extracted from nonrhizospheric rice soil and were screened for antifungal activity against M. oryzae using a leaf segment assay. Strains S170 and S9 showed significant antagonistic activity against M. oryzae in vitro and in leaf disk assays, and controlled M. oryzae infection under greenhouse conditions. The results showed that strains S170 and S9 could effectively control rice leaf blast and panicle neck blast after five spray treatments in field. This suggested that the bacterial strains S170 and S9 were valuable and promising for the biocontrol of rice disease caused by M. oryzae. Based on 16S rDNA, and gyrA and gyrB gene sequence analyses, S170 and S9 were identified as Bacillus amyloliquefaciens and B. pumilus, respectively. The research also demonstrated that B. amyloliquefaciens S170 and B. pumilus S9 could colonize rice plants to prevent pathogenic infection and evidently suppressed plant disease caused by 11 other plant pathogenic fungi. This is the first study to demonstrate that B. amyloliquefaciens and B. pumilus isolated from nonrhizospheric rice soil are capable of recolonizing internal rice stem tissues.
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