Sensitivity and control efficacy of a novel complex III inhibitor pyribencarb against Sclerotinia sclerotiorum

文献类型： 外文期刊

第一作者： Li, Ang

作者： Li, Ang;Cui, Xinyi;Yang, Weixu;Zhou, Xin;Zeng, Pengwen;Pang, Dingzhi;Xia, Shenjv;Shan, Hongying;Li, Ning;Li, Jinli;Liang, Hongjie

作者机构：

关键词： Sclerotinia sclerotiorum; Pyribencarb; Sensitivity; Control efficacy

期刊名称：JOURNAL OF PLANT DISEASES AND PROTECTION （ 影响因子：2.0； 五年影响因子：2.0 ）

ISSN： 1861-3829

年卷期： 2023 年 130 卷 5 期

页码：

收录情况： SCI

摘要： Sclerotinia sclerotiorum, a necrotrophic fungal plant pathogen, causes serious economic losses on a wide variety of hosts. In this study, the current sensitivity of S. sclerotiorum toward the new type QoI fungicide pyribencarb and morphological and biochemical effects of pyribencarb on this pathogen were investigated. The mean EC50 value for 100 isolates collected in 2014 was 0.0379 +/- 0.0163 mu g/mL with individual EC50 values ranging from 0.0068 to 0.0883 mu g/mL, and the EC50 values were normally distributed. Fluorescence microscopic analysis revealed pyribencarb in PDA at 0.10 mu g/mL had no obvious effects on the number of the cell nucleus or the development of septum of S. sclerotiorum. The result of light microscopy indicated that pyribencarb could make hyphae of S. sclerotiorum contorted and the offshoots increased. Pyribencarb at 0.02 and 0.10 mu g/mL significantly increased exopolysaccharide content and reduced cell membrane permeability and oxalic acid content (P < 0.05). There was no significant difference in the number (P = 0.75) or dry weight (P = 0.67) of sclerotia between the control and the treatment with pyribencarb at concentrations from 0.0125 to 0.2 mu g/mL. The observed mycelial growth inhibitions for the mixtures of pyribencarb at 0.02 mu g/mL and Congo red at 1 to 4 mg/mL or sodium dodecyl sulfate at 0.0025 to 0.02% were higher than the expected inhibitions. The protective and curative efficacies of pyribencarb were significantly higher (P < 0.004) than that of the reference fungicide carbendazim, and protective efficacy was superior to curative efficacy. Our findings suggest that pyribencarb has a remarkable impact on the morphological and biochemical characteristics of S. sclerotiorum thus advancing our understanding of the mode of action of pyribencarb on phytopathogenic fungi.

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