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Isoflavones extracted from Millettia pachyloba prevent the infection of the rice blast fungus by inhibiting its conidial germination and appressorium formation

文献类型： 外文期刊

作者： Lin, Qitong 1 ; Guo, Hong 3 ; Zhu, Yanqiu 1 ; Gao, Wenqiang 2 ; Zhu, Xiaoying 2 ; Lai, Daowan 1 ; Qi, Linlu 1 ; Li, Zhigang 4 ; Chen, Deng 5 ; Lu, Xunli 1 ; Zhao, Wensheng 1 ; Peng, You-Liang 1 ; Zhang, Zhenhua 1 ; Yang, Jun 1 ;

作者机构： 1.China Agr Univ, Sanya Inst, Sanya 72024, Peoples R China

2.China Agr Univ, Coll Plant Protect, Dept Plant Pathol, MARA Key Lab Pest Monitoring & Green Management, Beijing, Peoples R China

3.China Agr Univ, Dept Appl Chem, Beijing, Peoples R China

4.Hainan Univ, Sanya Inst Breeding & Multiplicat, Sch Trop Agr & Forestry, Haikou, Peoples R China

5.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Natl Key Lab Trop Crop Breeding, Sanya Haikou, Peoples R China

关键词： rice blast; plant-derived fungicides; isoflavonoid; rotenolone; ABC transporter

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：3.8； 五年影响因子：4.3 ）

ISSN： 1526-498X

年卷期： 2025 年 81 卷 6 期

页码：

收录情况： SCI

摘要： BACKGROUNDThe ascomycete Magnaporthe oryzae is a destructive phytopathogenic fungus that causes rice blast disease and can greatly reduce rice yields. Due to the widespread use of synthesized chemical fungicides and the frequent occurrence of fungicide resistance and environmental pollution as a result, it has become increasingly urgent to develop environmentally friendly biocontrol alternatives, including plant crude extracts.RESULTSIn this study, the crude extracts of the tropical plant Millettia pachyloba were screened out and exhibited excellent preventive effects against M. oryzae at 200 mu g mL-1. Bio-guided isolation of M. pachyloba was conducted and three isoflavonoids, rotenolone, durmillone, and durallone, whose chemical structures were determined using spectroscopic and spectrometric analyses, were obtained. The three isoflavonoids exhibited antifungal activities on conidial germination and appressorium formation in M. oryzae. Rotenolone had the strongest effect, with EC50 values of 57.81 mu g mL-1 on conidial germination and 19.14 mu g mL-1 on appressorium formation. Comparative metabolomics showed that differential metabolites were enriched in ABC transporter pathways and amino acid metabolic pathways when M. oryzae conidia were treated with rotenolone, suggesting that rotenolone interferes with amino acid transportation. Moreover, the M. pachyloba crude extract also effectively inhibited the infection of other fungal pathogens on tomato, apple, wheat, and maize.CONCLUSIONThe results suggest that isoflavones extracted from M. pachyloba prevent rice blast by inhibiting the infection-related morphogenesis of M. oryzae and may interfere with amino acid transport, demonstrating that M. pachyloba crude extract exhibits potential as a bio-fungicide for controlling fungal diseases in plants. (c) 2025 Society of Chemical Industry.

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