爱尔兰小麦Zymoseptoria群体QoI抗性和mtDNA多样性的患病率

IF 0.9 4区 农林科学 Q3 AGRICULTURE, MULTIDISCIPLINARY Irish Journal of Agricultural and Food Research Pub Date : 2019-01-01 DOI:10.2478/ijafr-2019-0004
S. Kildea, D. E. Bucar, F. Hutton, S. D. L. Rosa, T. E. Welch, S. Phelan
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引用次数: 4

摘要

摘要21世纪初,Quinone outside Inhibitor(QoI)杀菌剂抗性在爱尔兰小麦Zymoseptoria tritici群体中的出现和传播,直接影响了整组杀菌剂对小麦赤霉斑点病的防治效果。因此,在接下来的几个季节里,冬小麦的施用量急剧减少。即使在没有这些杀菌剂的情况下,病原体mtDNA中的抗性等位基因G143A的频率仍然非常高(>97%),因此,可以预见,目前的QoI杀菌剂的疗效将持续较差。在具有G143A的分离株中,在体外观察到对QoI吡喃梭菌毒素的敏感性差异。添加替代氧化酶(AOX)抑制剂水杨酰异羟肟酸增加了这些分离株的敏感性,表明QoI杀菌剂对呼吸的持续损害,尽管较弱。有趣的是,在那些被测试的菌株中,来自MFS1转运蛋白基因插入频率高的位点的菌株没有表现出这种敏感性的增加。在2017年采集的菌株中,共检测到19种mtDNA单倍型。系统发育分析证实了所有单倍型都有共同祖先的说法,尽管其中三个单倍型至少包含一个敏感菌株。
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Prevalence of QoI resistance and mtDNA diversity in the Irish Zymoseptoria tritici population
Abstract The emergence and spread of Quinone outside Inhibitor (QoI) fungicide resistance in the Irish Zymoseptoria tritici population in the early 2000s had immediate impacts on the efficacy of the entire group of fungicides for the control of septoria tritici blotch. As a result, a dramatic reduction in the quantities applied to winter wheat occurred in the following seasons. Even in the absence of these fungicides, the frequency of the resistance allele, G143A in the pathogens mtDNA has remained exceptionally high (>97%), and as such, it can be anticipated that continued poor efficacy of current QoI fungicides will be observed. Amongst the isolates with G143A, differences in sensitivity to the QoI pyraclostrobin were observed in vitro. The addition of the alternative oxidase (AOX) inhibitor salicylhydroxamic acid increased sensitivity in these isolates, suggesting some continued impairment of respiration by the QoI fungicides, albeit weak. Interestingly, amongst those tested, the strains from a site with a high frequency of inserts in the MFS1 transporter gene known to enhance QoI efflux did not exhibit this increase in sensitivity. A total of 19 mtDNA haplotypes were detected amongst the 2017 strain collection. Phylogenetic analysis confirmed the suggestion of a common ancestry of all the haplotypes, even though three of the haplotypes contained at least one sensitive strain.
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来源期刊
CiteScore
2.50
自引率
20.00%
发文量
23
审稿时长
>36 weeks
期刊介绍: The Irish Journal of Agricultural and Food Research is a peer reviewed open access scientific journal published by Teagasc (Agriculture and Food Development Authority, Ireland). Manuscripts on any aspect of research of direct relevance to Irish agriculture and food production, including plant and animal sciences, food science, agri environmental science, soils, engineering, buildings, economics and sociology, will be considered for publication. The work must demonstrate novelty and relevance to the field of research. Papers published or offered for publication elsewhere will not be considered, but the publication of an abstract does not preclude the publication of the full paper in this journal.
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