TaqMan-MGB PCR Method for Rapid Detection of QoI Fungicide Resistance in Chinese Populations of Plasmopara viticola
文献类型: 外文期刊
第一作者: Huang, Xiaoqing
作者: Huang, Xiaoqing;Wang, Xina;Zhou, Lianzhu;Kong, Fanfang;Liu, Yongqiang;Wang, Zhongyue;Zhang, Hao
作者机构:
关键词: Plasmopara viticola; quinone outside inhibitor fungicides; resistance; TaqMan-MGB PCR
期刊名称:PLANT DISEASE ( 影响因子:4.5; 五年影响因子:5.0 )
ISSN: 0191-2917
年卷期: 2023 年
页码:
收录情况: SCI
摘要: Grape downy mildew caused by Plasmopara viticola is one of the most devastating diseases of grapevine worldwide. Quinone outside inhibitor (QoI) fungicides are commonly used for the control of the pathogen in grape fields across China. However, their recurrent use could lead to the emergence of resistance against these compounds. Based on the most common mutation in resistant isolates, a glycine to alanine substitution at amino acid position 143 (G143A) in the cytochrome b protein, a TaqMan-MGB PCR was developed for the rapid detection of resistance to the QoI fungicide azoxystrobin in P. viticola. Specificity and sensitivity of this method showed it could specifically detect the point mutations linked with QoI resistance in P. viticola, and the detection limit was 0.2 pg. It could also quantify the resistance allele even in isolate mixtures containing as little as 5% QoI-resistant P. viticola strains. With this method, a large P. viticola population (n = 2,373) was screened, and QoI-resistant isolates were identified for the first time in China. The average frequencies of the resistant genotype from eight major-grapevine regions were up to 66%. Taken together, the results not only provide a novel tool for the rapid distinction and quantification of the QoI-resistant allele in P. viticola but also provide important references for fungicide selection and application, which will facilitate resistance management of grape downy mildew and improve grape production systems in Chinese vineyards.
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