Occurrence, Distribution, and Characteristics of Boscalid-Resistant Corynespora cassiicola in China

文献类型： 外文期刊

第一作者： Zhu, Fadi

作者： Zhu, Fadi;Shi, Yanxia;Xie, Xuewen;Chai, Ali;Li, Baoju

作者机构：

期刊名称：PLANT DISEASE （ 影响因子：4.438； 五年影响因子：4.7 ）

ISSN： 0191-2917

年卷期： 2019 年 103 卷 1 期

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收录情况： SCI

摘要： Corynespora blight, caused by Corynespora cassiicola (Berk. & M.A. Curtis) C.T. Wei, has become an important disease affecting cucumber in China. Its management mainly depends on fungicides; however, no research has been conducted to assess the sensitivity of C. cassiicola in China to boscalid, a succinate dehydrogenase inhibitor (SDHI). To facilitate boscalid resistance monitoring, baseline sensitivity was established. The EC50 value (i.e., the concentration that results in 50% mycelia] growth inhibition) frequency distribution was unimodal with a right-hand tail; with the means 0.95 +/- 0.51 mu g/ml and the range 0.03 to 2.85 mu g/ml. We then assessed the sensitivity of C. cassiicola to boscalid using discriminatory doses and EC50 values. In total, 27.8% of the 798 isolates were resistant, distributed in five provinces and two municipalities. Thirty-seven isolates with different resistance levels to boscalid were also evaluated for their sensitivity to carboxin, fluopyram, and penthiopyrad. Seven SDHI resistance patterns were observed (i.e., I: Bos(MR)Fluo(MR)Pen(LR)Car(SS); II: Bos(VHR)Fluo(SS) Pen(MR)Car(R); III: Bos(LR)Fluo(MR)Pen(LR)Car(R); IV: Bos(MR)Fluo(MR)Pen(MR) Car(R); V: Bos(HR)Fluo(MR)Pen(HR)Car(R); VI: Bos(HR)Fluo(HR)Pen(HR)Car(R); and VII: Bos(HR)Fluo(SS)Pen(LR)Car(R), VHR: very highly resistant; HR: highly resistant; MR: moderately resistant; LR: low resistant; R: resistant; SS: supersensitive), corresponding to seven mutations in sdhB/C/D genes, respectively.

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