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湖南省杉木炭疽病病原菌鉴定及抗药性研究

Identification and fungicide resistance of anthracnose pathogen in Cunninghamia lanceolata in Hunan Province

  • 摘要: 为明确湖南省杉木炭疽病的病原菌种类及其抗药性特征,从湖南省怀化市、湘潭市、郴州市和株洲市4个地区采集样本,共分离出124株炭疽菌菌株。通过ApMat基因序列的系统发育分析,结合形态学特征,鉴定所有菌株均为沧源炭疽菌Colletotrichum cangyuanense Z.F. Yu。采用区分剂量法检测菌株对多菌灵、乙霉威、戊唑醇和咪鲜胺4种杀菌剂的抗药性。结果表明,28株(22.6%)对多菌灵具有抗性、26株(20.9%)对戊唑醇具有抗性,其中4株(3.2%)对多菌灵和戊唑醇均具有抗性。对β-微管蛋白基因序列分析发现,28株多菌灵抗性菌株均无突变。研究表明,湖南省杉木炭疽病菌已对多菌灵和戊唑醇产生抗药性,而对咪鲜胺未检出抗性。这一结果为制定防治策略提供了重要依据。

     

    Abstract: To clarify the pathogen species and fungicide resistance characteristics of Chinese fir anthracnose in Hunan Province, China, this study collected samples from four regions (Huaihua, Xiangtan, Chenzhou, and Youxian County of Zhuzhou) in Hunan, obtaining 124 Colletotrichum isolates. Through phylogenetic analysis of the ApMat gene sequence combined with morphological characteristics, all strains were identified as Colletotrichum cangyuanense Z.F. Yu. The resistance of these isolates to four fungicides (carbendazim, diethofencarb, tebuconazole, and prochloraz) was evaluated using discriminatory dose assays. The results demonstrated that 28 isolates (22.6%) exhibited resistance to carbendazim, while 26 isolates (20.9%) showed resistance to tebuconazole, including 4 isolates (3.2%) displaying dual resistance to both fungicides. Sequence analysis of the β-tubulin gene revealed no mutations in all 28 carbendazim-resistant isolates. This study confirms the emergence of resistance to carbendazim and tebuconazole in C. cangyuanense populations infecting Chinese fir in Hunan, while no prochloraz resistance was detected, providing critical evidence for developing control strategies.

     

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