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The mechanisms of target and non-target resistance to QoIs in Corynespora Cassiicola by Bingxue Sun; Rongjia Zhou; Guangxue Zhu; Xuewen Xie; Ali Chai; Lei Li; Tengfei Fan; Shengping Zhang; Baoju Li; Yanxia Shi is a Agricultural and Biological Sciences article available to read on EtoBox.

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Corynespora leaf spot, caused by Corynespora cassiicola, is a foliar disease in cucumber. While the application of quinone outside inhibitors (QoIs) is an effective measure for disease control, it carries the risk of resistance development. In our monitoring of trifloxystrobin resistance from 2008 to 2020, C. cassiicola isolates were categorized into three populations: sensitive isolates (S, 0.01 < EC 50 < 0.83 μg/mL), moderately resistant isolates (MR, 1.18 < EC 50 56.98 μg/mL). The resistance frequency reached up to 90% during this period, with an increasing trend observed in the annual average EC 50 values of all the isolates. Analysis of the CcCytb gene revealed that both MR and HR populations carried the G143A mutation. Additionally, we identified mitochondrial heterogeneity, with three isolates carrying both G143 and A143 in MR and HR populations. Interestingly, isolates with the G143A mutation (G143A-MR and G143A-HR) displayed differential sensitivity to QoIs. Further experiments involving gene knockout and complementation demonstrated that the major facilitator superfamily (MFS) transporter (CcMfs1) may contribute to the disparity in sensitivity to QoIs between the G143A-

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Author

Bingxue Sun; Rongjia Zhou; Guangxue Zhu; Xuewen Xie; Ali Chai; Lei Li; Tengfei Fan; Shengping Zhang; Baoju Li; Yanxia Shi

Publisher

Elsevier BV

Published

2024

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)