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Virulence variability of Ethiopian Zymoseptoria tritici isolates and efficacy of wheat genotypes and Stb resistance genes against the isolates
European Journal of Plant Pathology ( IF 1.8 ) Pub Date : 2020-10-22 , DOI: 10.1007/s10658-020-02125-3
Tilahun Mekonnen , Teklehaimanot Haileselassie , Bekele G. Abayo , Kassahun Tesfaye

Septoria tritici blotch caused by the fungus Zymoseptoria tritici is a serious threat to wheat production worldwide. Knowledge of physiologic specialization of the pathogen and identification of potential source of resistance are prerequisite for designing durable management strategies. The present study was targeted to determine the virulence pattern of eight bread wheat derived Ethiopian Z. tritici isolates, and efficacy of known Stb resistance genes and wheat genotypes against the isolates. Disease severity analysis confirmed the presence of specific interaction in the pathogen. Pathogenecity assay identified 60 isolate-specific resistances among all (n = 360) interactions. Of 45 wheat genotypes, 40% showed no isolate-specific resistance responses and were susceptible to all isolates. Tested Z. tritici isolates showed significantly different virulence patterns with virulence on 71% to 93% wheat genotypes. Isolate I1 was found to be the most virulent (on 93% of the tested genotypes), and hence, useful for germplasm screening. Among tested known Stb genes, Stb13/Stb14 in Salamouni did not confer resistance to any of the isolates, while Stb16 in KM7 conferred broad spectrum resistance to 75% of them, and thus, promising source of resistance to STB in Ethiopia. Among tested 20 commercial cultivars, 45% did not confer resistance to all the isolates. Three genotypes (MURGA, Km7 and the cultivar Hidase) conferred the greatest level of resistance to the tested Ethiopian Zymoseptoria tritici isolates. The information is very useful for wheat breeders and the wheat farming community in making informed decisions to manage STB disease in Ethiopia.



中文翻译:

埃塞俄比亚Zymoseptoria tritici分离株的毒力变异性以及小麦基因型和Stb抗性基因对分离株的效力

真菌Zymoseptoria tritici引起的小麦纹枯病斑是对全世界小麦生产的严重威胁。了解病原体的生理专长和识别潜在的耐药源是设计持久管理策略的前提。本研究旨在确定八种面包小麦衍生的埃塞俄比亚Z. tritici分离株的毒力模式,以及已知的Stb抗性基因和小麦基因型对分离株的功效。疾病严重程度分析确认了病原体中存在特定的相互作用。病原性分析确定了所有(n = 360)互动。在45个小麦基因型中,40%没有表现出分离株特异性抗性反应,并且对所有分离株均敏感。经测试的Z. tritici分离株显示出明显不同的毒力模式,其中71%至93%的小麦基因型具有毒力。发现分离物I 1最具毒性(在测试的基因型中占93%),因此可用于种质筛选。在已测试的已知Stb基因中,萨拉莫尼的Stb13 / Stb14没有赋予对任何分离株的抗性,而Stb16在KM7赋予其中75%的广谱抗性,因此,在埃塞俄比亚有希望成为抗STB的来源。在测试的20个商品栽培品种中,有45%并未赋予所有分离株抗性。三种基因型(MURGA,Km7和品种Hidase)赋予了对经测试的埃塞俄比亚Zymoseptoria tritici分离株最大的抗性水平。该信息对于小麦育种者和小麦种植社区做出明智的决定来管理埃塞俄比亚机顶盒疾病非常有用。

更新日期:2020-11-12
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