Two imide substances from a soil-isolated Streptomyces atratus strain provide effective biocontrol activity against grapevine downy mildew

文献类型： 外文期刊

第一作者： Liang, Chunhao

作者： Liang, Chunhao;Liang, Chunhao;Zang, Chaoqun;Zhao, Kuihua;Yu, Shuyi;McDermott, Mark I.;Huang, Yuqian

作者机构：

关键词： Antimicrobial spectrum;biological control;cycloheximide;5-acetoxycycloheximide;Plasmopara viticola;Streptomyces atratus

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

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收录情况： SCI

摘要： Grapevine downy mildew (Plasmopara viticola) is a devastating disease of grapevine. In this study, 151 actinomycete isolates were obtained and tested for antagonistic activity against P. viticola. The assay suggested that 28 isolates displayed antagonistic effects to varying degrees. The greatest reduction in disease severity was observed with isolate PY-1, which reduced disease severity by 92.13% in the detached leaf assay, and by 83% in a field assay. It was identified as Streptomyces atratus using the 16S rDNA sequence analysis. To elucidate the antagonistic mechanism of PY-1 against P. viticola, scanning electron microscopy showed that major damage to the pathogens sporangia and sporangiophores was observed after treatment for PY-1. Furthermore, PY-1 showed antagonistic activity against other pathogens, including: Botrytis cinerea, Colletotrichum orbiculare, Fusarium oxysporum, Phytophthora capsici and Phytophthora infestans. Two imide compounds were purified from the fermentation liquid using silica gel chromatography and high-performance liquid chromatography and identified as 5-acetoxycycloheximide and cycloheximide using nuclear magnetic resonance. Both compounds showed significant antagonistic activity against P. viticola, determining a reduction in disease severity by 65% and 84%, respectively. In conclusion, 5-acetoxycycloheximide and cycloheximide were identified for the first time in a new S. atratus strain able to effectively control grapevine downy mildew.

分类号： S476

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