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Phytotoxin of rice aggregate sheath spot pathogen Rhizoctonia oryzae-sativae and its biological activities

文献类型： 外文期刊

作者： Wang, Xiaoyu 1 ; Wang, Aimin 1 ; Chen, Zhiyi 1 ; Wei, Lihui 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing 210014, Peoples R China

关键词： aggregate sheath spot; phytotoxins; gas chromatography-mass spectrometry; biological activity

期刊名称：CANADIAN JOURNAL OF MICROBIOLOGY （ 影响因子：2.419； 五年影响因子：2.35 ）

ISSN： 0008-4166

年卷期： 2021 年 67 卷 11 期

页码：

收录情况： SCI

摘要： Rice aggregate sheath spot disease occurs in many countries and causes serious yield losses. In China, the disease-causing fungus Rhizoctonia otyzae-sativae was reported in 1985, and since then, it has rarely been reported in major rice-growing areas after almost 30 years. Compared with Rhizoctonia solani, R. oryzae-sativae has a significantly different physiological morphology and growth status, although both fungi affect rice leaves in very similar ways. The optimum temperature for the suitable growth of R. otyzae-sativae is 31 degrees C, which is consistent with previous reports. We extracted phytotoxins from R myzae-sativae and analyzed its biological activity via the detached leaf and radicle inhibition methods. Rhizoctonia solani and R. myzae-sativae exhibit differences in terms of pathogenicity and toxin activity, which indicates that these fungi may produce different toxin components. Based on gas chromatography-mass spectrometry data, esters, phenols, and other components were present in the crude toxin extract of R. oryzae-sativae. Our research provides a new method for studying the phytotoxins of R. oryzae-sativae. However, further studies are needed to elucidate the pathogenic mechanisms responsible for aggregate sheath spot disease in rice.

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