Investigation of the antifungal activity of the dicarboximide fungicide iprodione against Bipolaris maydis

文献类型： 外文期刊

第一作者： Sun, Jiazhi

作者： Sun, Jiazhi;Pang, Chaoyue;Cheng, Xin;Yang, Bingyun;Jin, Bingbing;Jin, Ling;Qi, Yongxia;Sun, Yang;Chen, Xing;Cao, Haiqun;Chen, Yu;Liu, Wende;Sun, Jiazhi;Pang, Chaoyue;Cheng, Xin;Yang, Bingyun;Jin, Bingbing;Jin, Ling;Qi, Yongxia;Sun, Yang;Chen, Xing;Cao, Haiqun;Chen, Yu;Sun, Jiazhi;Pang, Chaoyue;Cheng, Xin;Yang, Bingyun;Jin, Bingbing;Jin, Ling;Qi, Yongxia;Sun, Yang;Chen, Xing;Cao, Haiqun;Chen, Yu;Sun, Jiazhi;Pang, Chaoyue;Cheng, Xin;Yang, Bingyun;Jin, Bingbing;Jin, Ling;Qi, Yongxia;Sun, Yang;Chen, Xing;Cao, Haiqun;Chen, Yu;Sun, Jiazhi;Pang, Chaoyue;Cheng, Xin;Yang, Bingyun;Jin, Bingbing;Jin, Ling;Qi, Yongxia;Sun, Yang;Chen, Xing;Cao, Haiqun;Chen, Yu

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关键词： Iprodione; Sensitivity baseline; Bipolaris maydis; Bioactivity

期刊名称：PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY （ 影响因子：4.7； 五年影响因子：4.7 ）

ISSN： 0048-3575

年卷期： 2023 年 190 卷

页码：

收录情况： SCI

摘要： Southern corn leaf blight (SCLB), mainly caused by Bipolaris maydis, is a destructive disease of maize worldwide. Iprodione is a widely used dicarboximide fungicide (DCF); however, its antifungal activity against B. maydis has not been well studied until now. In this study, the sensitivity of 103 B. maydis isolates to iprodione was determined, followed by biochemistry and physiology assays to ascertain the fungicide's effect on the morphology and other biological properties of B. maydis. The results indicated that iprodione exhibited strong inhibitory activity against B. maydis, and the EC50 values in inhibiting mycelial growth ranged from 0.088 to 1.712 mu g/mL, with a mean value of 0.685 +/- 0.687 mu g/mL. After treatment with iprodione, conidial production of B. maydis was decreased significantly, and the mycelia branches increased with obvious shrinkage, distortion and fracture. Moreover, the expression levels of the osmotic pressure-related regulation genes histidine kinase (hk) and Ssk2type mitogen-activated protein kinase (ssk2) were upregulated, the glycerin content of mycelia increased significantly, the relative conductivity of mycelia increased, and the cell wall membrane integrity was destroyed. The in vivo assay showed that iprodione at 200 mu g/mL provided 79.16% protective efficacy and 90.92% curative efficacy, suggesting that the curative effect was better than the protective effect. All these results proved that iprodione exhibited strong inhibitory activity against B. maydis and provided excellent efficacy in controlling SCLB, indicating that iprodione could be an alternative candidate for the control of SCLB in China.

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