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Analysis of the prochloraz-Mn resistance risk and its molecular basis in Mycogone rosea from Agaricus bisporus

文献类型： 外文期刊

作者： Du, Yixin 1 ; Shi, Niuniu 1 ; Ruan, Hongchun 1 ; Miao, Jianqiang 3 ; Yan, He 3 ; Shi, Chunxi 3 ; Chen, Furu 1 ; Liu, Xili 3 ;

作者机构： 1.Fujian Acad Agr Sci, Inst Plant Protect, Fuzhou 350013, Fujian, Peoples R China

2.Fujian Key Lab Monitoring & Integrated Management, Fuzhou, Peoples R China

3.Northwest Agr & Forestry Univ, Coll Plant Protect, Yangling 712000, Shaanxi, Peoples R China

4.Minist Agr China, Key Lab Northwestern Loess Plateau Crops Pest Man, Yangling, Shaanxi, Peoples R China

关键词： Mycogone rosea; prochloraz-Mn; DMI fungicide; resistance mechanism; fitness

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.845； 五年影响因子：4.674 ）

ISSN： 1526-498X

年卷期： 2021 年 77 卷 10 期

页码：

收录情况： SCI

摘要： BACKGROUND Wet bubble disease (WBD), caused by Mycogone rosea, is one of the most serious diseases of white button mushroom (Agaricus bisporus) in China. Prochloraz-Mn is the main fungicide used in the management of WBD. To provide essential references for early warning of prochloraz-Mn resistance and management of WBD, this study was performed to assess the resistance risk to prochloraz-Mn in M. rosea, as well as its underlying resistance mechanism. RESULTS Eight stable prochloraz-Mn-resistant mutants with a mutation frequency of 1.3 x 10(-4) were generated and resistance factors ranged from 2.57 to 7.80 after 10 successive culture transfers. All eight resistant mutants exhibited fitness penalties in decreased sporulation and pathogenicity. Positive cross-resistance was observed between prochloraz-Mn and prochloraz or imazalil, but not between prochloraz-Mn and diniconazole, fenbuconazole, thiabendazole or picoxystrobin. The point mutation F511I in MrCYP51 protein was found in six mutants and the point mutation G464S occurred only in the SDW2-2-1M mutant. The up-regulated expression of MrCYP51 in all mutants was less than that in their parental isolates when exposed to prochloraz-Mn. Without prochloraz-Mn treatment, MrCYP51 expression was up-regulated in GX203-3-1M and FJ58-2-1M mutants, whereas it was down-regulated in other mutants compared to their respective parental isolates. CONCLUSION Genotypes with two separate point mutations, F511I and G464S in MrCYP51, may be associated with resistance to prochloraz-Mn in M. rosea. The resistance risk of M. rosea to prochloraz-Mn is likely to be low to moderate, indicating that prochloraz-Mn can still be used reasonably to control WBD.

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