文献类型： 外文期刊
作者： Cheng, Xingkai 1 ; Man, Xuejing 1 ; Wang, Zitong 2 ; Liang, Li 1 ; Zhang, Fan 1 ; Wang, Zhiwen 1 ; Liu, Pengfei 1 ; Lei, 1 ;
作者机构： 1.China Agr Univ, Dept Plant Pathol, Beijing 100193, Peoples R China
2.Northwest A&F Univ, Coll Plant Protect, Yangling 712100, Shaanxi, Peoples R China
3.Xinjiang Acad Agr Sci, Inst Nucl & Biol Technol, 403 Nanchang Rd, Urumqi 830091, Peoples R China
4.Univ Maine, Sch Food & Agr, Orono, ME 04469 USA
关键词： multidrug resistance; Rhizoctonia solani; resistance risk; cross resistance
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： 2020 年 104 卷 10 期
页码：
收录情况： SCI
摘要： Rhizoctonia solani is a widely distributed soilborne plant pathogen, and can cause significant economic losses to crop production. In chemical controls, SYP-14288 is highly effective against plant pathogens, including R. solani. To examine the sensitivity to SYP-14288, 112 R. solani isolates were collected from infected rice plants. An established baseline sensitivity showed that values of effective concentration for 50% growth inhibition (EC50) ranged from 0.0003 to 0.0138 mu g/ml, with an average of 0.0055 +/- 0.0030 mu g/ml. The frequency distribution of the EC50 was unimodal and the range of variation factor (the ratio of maximal over minimal EC50) was 46.03, indicating that all wild-type strains were sensitive to SYP-14288. To examine the risk of fungicide resistance, 20 SYP-14288-resistant mutants were generated on agar plates amended with SYP-14288. Eighteen mutants remained resistant after 10 transfers, and their fitness was significantly different from the parental strain. All of the mutants grew more slowly but showed high virulence to rice plants, though lower than the parental strain. A cross-resistance assay demonstrated that there was a positive correlation between SYP-14288 and fungicides having or not having the same mode of action with SYP-14288, including fluazinam, fentin chloride, fludioxonil, difenoconazole, cyazofamid, chlorothalonil, and 2,4-dinitrophen. This result showed a multidrug resistance induced by SYP-14288, which could be a concern in increasing the spectrum of resistance in R. solani to commonly used fungicides.
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