Inhibitory Action of Biofungicide Physcion on Initial and Secondary Infection of Magnaporthe oryzae

文献类型： 外文期刊

第一作者： Wang, Na

作者： Wang, Na;Cai, Mengling;Wang, Xin;Xie, Yaqiong;Ni, Hanwen;Wang, Na

作者机构：

关键词： bioactivity;biocontrol;infection process;physcion;rice blast

期刊名称：JOURNAL OF PHYTOPATHOLOGY （ 影响因子：1.789； 五年影响因子：1.574 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Rice blast, caused by the ascomycete fungus Magnaporthe oryzae, is one of the most destructive plant diseases in the world and a serious threat to global food security. Biofungicide physcion, extracted from roots of Chinese traditional herb rhubarb, has been commercialized to control cucumber powdery mildew (Podosphaera fuliginea) in China as a new active and environmentally-friendly ingredient. This study investigated its bioactivity on rice blast and impact on the infection of M. oryzae. Physcion was effective on M. oryzae with 50% inhibition concentration of 18.19 mg/l on the fungus mycelium growth in vitro and provided 86 and 98% control efficacy in vivo at the concentrations of 40 and 60 mg/l, respectively. It inhibited the initial infection of M. oryzae by inhibiting growth of mycelia, the germination of conidia and the formation of appressoria. Moreover, it inhibited the secondary infection of the fungus at the concentration of 40 mg/l, but had no influence at the low concentrations of 1.25-20 mg/l. So physcion might be a promising natural plant extract that is worthy of being explored to apply on the control of rice blast.

分类号： Q945

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