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Biological activity of pterostilbene against Peronophythora litchii,the litchi downy blight pathogen

Biological activity of pterostilbene against Peronophythora ...

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中国植物病理学会第十一届全国会员代表大会暨2018年学术年会

作者： Xu Dandan Deng Yizhen Xi Pinggen Gao Lingwang Jiang Zide Department of Plant Pathology Guangdong Province Key Laboratory of Microbial Signals and Disease ControlSouth China Agricultural University College of Plant Protection China Agricultural University

Peronophythora litchii,the oomycete pathogen of litchi downy blight,infects leaves,flowers and fruits of litchi,leading to great economic loss during fruit riping,storage and ***,the new effective,environment-friendly fungicide(s) is urgently *** this study,eight phenolic compounds which exhibited strong bioactivity on Botrytis cinerea were selected to test their effectiveness on the inhibition of ***,which conducted by treating sporangia suspension with different tested phenolic compounds at the concentration of 10 and 50 mg/*** results indicated that pterostilbene showed strongest antifungal activity on sporangia germination among all tested compounds,which substantially suppressed sporangia germination of ***,with inhibition rate of 100%in the treatment of pterostilbene at 32 mg/L,and its IC value on zoospore release was evaluated to be 6.8 mg/***,Sytox green uptake assay and ultrastructure observation were used to explore to the action mechanism of pterostilbene on the inhibition of ***,the results showed that pterostilbene significantly inhibit the mycelial growth and induced deleterious morphological modifications and ultrastructural alteration,including deformation and shrinking of mycelia and sporangia,the damage of cell wall,plasma membrane and *** fruit decay and peel browning caused by *** during postharvest storage or transportation are two major factors affecting the commercial value of litchi fruit,and the effectiveness of pterostilbene on litchi downy blight control was *** assay demonstrated pterostilbene application significantly reduced the decay of litchi fruit and leaf and peel browning caused by ***,with the decay index reduction up to 48.6%and peel browning of litchi reduced from 3.5 to 1.8 after treated with 1 600 mg/L *** research provides further proof that pterostilbene is a potential and better candidate agent for antifungal agrochem

关键词： Litchi postharvest rot pterostilbene antifungal activity peel browning

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