In Vitro Determination of the Sensitivity of Fusarium graminearum to Fungicide Fluopyram and Investigation of the Resistance Mechanism

文献类型： 外文期刊

第一作者： Jiang, Jia

作者： Jiang, Jia;Hu, Bingyang;Cui, Yongyuan;Qian, Le;Xu, Jianqiang;Liu, Shengming;Jiang, Jia;Hu, Bingyang;Cui, Yongyuan;Qian, Le;Xu, Jianqiang;Liu, Shengming;Gao, Xuheng

作者机构：

关键词： Fusarium head blight; Fusarium graminearum; fluopyram; resistance risk; resistance mechanisms

期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：6.2； 五年影响因子：6.4 ）

ISSN： 0021-8561

年卷期： 2025 年 73 卷 7 期

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收录情况： SCI

摘要： Fusarium head blight (FHB), caused by Fusarium graminearum, is a significant disease of wheat. In this study, the sensitivity of 102 F. graminearum isolates to fluopyram was determined based on inhibition of conidia germination and mycelial growth. The EC50 value ranged from 0.0952 to 0.2717 mu g/mL and1.0326 to 4.8512 mu g/mL, with the mean EC50 value of 0.1631 +/- 0.0383 and 2.5638 +/- 0.7500 mu g/mL, respectively. The resistance of the fluopyram-resistant mutants could be stably inherited, and the survival fitness of the mutants was higher than that of the parental isolates. Positive cross-resistance was observed between fluopyram and pydiflumetofen, but no cross-resistance was observed between fluopyram and epoxiconazole, phenamacril, metconazole, carbendazim, or fludioxonil. Amino acid substitution A73 V was detected on the FgSDHC1 subunit, and the FgSdhC 1 gene was significantly upregulated after exposure to fluopyram. These results indicate that fluopyram exerts its inhibitory activity by targeting the FgSdhC 1 gene of F. graminearum.

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