Scholarlink

<p>Quinone outside inhibitor (QoI) fungicides have been used intensively in the management of Alternaria brown spot (ABS) disease caused by <i>Alternaria alternata</i> on tangerine. The aim of this study was to investigate fitness variables and competitive abilities of mixtures of resistant (QoI-R) and sensitive (QoI-S) <i>A. alternata</i> isolates. Fitness variables including oxidative stress <i>in vitro</i>, incubation period, disease severity and conidial production on tangor leaves were not significantly different between the QoI-R and QoI-S isolate groups. The <i>in vitro</i> assays revealed that the QoI-R isolates group had higher EC<sub>50</sub> for azoxystrobin and pyraclostrobin, higher conidial germination, higher mycelial growth in PDA and higher conidial production. However, the QoI-R isolates group was also highly sensitive to osmotic stress. The <i>in vivo</i> competition test indicated a competitive disadvantage of the QoI-R isolate in comparison with the QoI-S isolate as a lower number of resistant conidia were harvested from ABS lesions even on leaves inoculated with mixtures containing higher proportions of QoI-R conidia. These results provide evidence of fitness costs and competitive disadvantages of the <i>A. alternata</i> mutant <i>cytb</i>-G143A.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Fitness cost and competitive disadvantages of a G143A mutant Alternaria alternata on tangerine resistant to QoI fungicides

  • 期刊论文

  • 发表日期：

    2025年3月26日

查看全文
  • Adriano Francis Dorigan,
  • Silvino Intra Moreira,
  • Thiago Oliveira Condé,
  • Patricia Ricardino da Silveira,
  • Indiara Carol Lopes Pinheiro,
  • Paulo Cezar Ceresini,
  • Eduardo Alves

摘要

Quinone outside inhibitor (QoI) fungicides have been used intensively in the management of Alternaria brown spot (ABS) disease caused by Alternaria alternata on tangerine. The aim of this study was to investigate fitness variables and competitive abilities of mixtures of resistant (QoI-R) and sensitive (QoI-S) A. alternata isolates. Fitness variables including oxidative stress in vitro, incubation period, disease severity and conidial production on tangor leaves were not significantly different between the QoI-R and QoI-S isolate groups. The in vitro assays revealed that the QoI-R isolates group had higher EC50 for azoxystrobin and pyraclostrobin, higher conidial germination, higher mycelial growth in PDA and higher conidial production. However, the QoI-R isolates group was also highly sensitive to osmotic stress. The in vivo competition test indicated a competitive disadvantage of the QoI-R isolate in comparison with the QoI-S isolate as a lower number of resistant conidia were harvested from ABS lesions even on leaves inoculated with mixtures containing higher proportions of QoI-R conidia. These results provide evidence of fitness costs and competitive disadvantages of the A. alternata mutant cytb-G143A.