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Stenotrophomonas maltophilia HW2 enhanced cucumber resistance against cucumber green mottle mosaic virus

文献类型： 外文期刊

作者： Li, Hongwei 1 ; Huang, Wenxiang 1 ; Xu, Long 1 ; Zhou, Xiaosi 1 ; Liu, Hongxia 1 ; Cheng, Zhaobang;

作者机构： 1.Nanjing Agr Univ, Dept Plant Pathol, Coll Plant Protect, Nanjing 210095, Jiangsu, Peoples R China

2.Nanjing Agr Univ, Key Lab Integrated Pest Management Crops Eastern, Minist Agr, Nanjing 210095, Jiangsu, Peoples R China

3.Nanjing Agr Univ, Key Lab Integrated Pest

关键词： Biocontrol efficacy;Cucumber green mottle mosaic virus;Gene detection;Plant Growth-promoting rhizobacteria

期刊名称：JOURNAL OF PLANT BIOLOGY （ 影响因子：2.434； 五年影响因子：2.455 ）

ISSN： 1226-9239

年卷期： 2016 年 59 卷 5 期

页码：

收录情况： SCI

摘要： Cucumber green mottle mosaic virus (CGMMV) is a major limiting factor in the production of cucumber plants worldwide. In the present study, we use plant growth-promoting rhizobacteria (PGPR) to control this virus effectively. Stenotrophomonas maltophilia HW2 was isolated from healthy cucumber root, exhibited a good biocontrol efficacy against CGMMV. Here, it is documented that 20 d after virus inoculation, the biocontrol efficacy of HW2 reached 52.61%. HW2 can effectively colonize in cucumber rhizosphere, and also promoted cucumber plants growth. We also examined the effect of HW2 on viral replication and its mechanism. Compared with the control, HW2 pre-treated plants could delay virus replication for more than 3 d and inhibit viral protein genes (CP, MP, Rep) expression in the cucumber leaf. The expression of antioxidant enzyme genes (SOD and CAT) and defense-related genes (PR1 and PR5) were quickly induced by HW2. These results suggest that HW2 induced plant defense responses to CGMMV by increasing the expression of defense response genes. We report for the first time that Stenotrophomonas maltophilia improved cucumber resistance against CGMMV, which highlights the applying of PGPR on controlling of virus diseases.

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