High resistance risk of Phytophthora colocasiae to azoxystrobin in southeastern of China

文献类型： 外文期刊

第一作者： Wang, Jinmiao

作者： Wang, Jinmiao;Chen, Songyu;Zhou, Ying;Chen, Fengping;Wang, Jinmiao;Chen, Songyu;Zhou, Ying;Chen, Fengping;Peng, Qin;Shi, Niuniu;Du, Yixin

作者机构：

关键词： Phytophthora colocasiae; Quinone outside inhibitor; Cytochrome b; G142A

期刊名称：PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY （ 影响因子：4.2； 五年影响因子：4.6 ）

ISSN： 0048-3575

年卷期： 2024 年 202 卷

页码：

收录情况： SCI

摘要： Quinone outside inhibitor (QoI) has been applied to manage taro leaf blight caused by Phytophthora colocasiae in southeastern of China for many years. The risk of P. colocasiae to QoI and the potential resistant mechanism remain unknown. In this study, the 74 P. colocasiae strains were sampled from southeastern of China. Sequence analysis of the QoI target Cytb showed one nucleotide variant in the fragment of this gene in this population, producing two haplotypes. The nucleotide variant leads to codon change at 142 (GGT to GCT) producing A142 (alanine) and G142 (glycine) in Hap_1 and Hap_2 strains, respectively. The sensitivity differentiation to azoxystrobin of two haplotypes were observed in vitro. The Hap_1 and Hap_2 strains were confirmed resistant and sensitive by control efficacy of label rate fungicide application, which was 3.0% and 88.8% treated with 500 mu g/ mL azoxystrobin, respectively. In addition, 10.0 mu g/mL azoxystrobin plus 50 mu g/mL salicylhydroxamic acid (SHAM) supplemented in PDA medium was identified as a discriminatory dose for differentiation of these two phenotype strains. The azoxystrobin resistant frequency reached 86.5%, indicating prevalence of QoI resistance in the field. Further fitness related features showed that no significant difference in temperature sensitivity, mycelial growth rate, sporangia production, zoospore release and aggressiveness between azoxystrobin-resistant and sensitive strains indicating no potential fitness cost for azoxystrobin resistance. Taken together, azoxystrobin resistance need to be taken into consideration to manage taro leaf blight in southeastern of China.

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