Centre for Crop and Disease Management, Curtin University, Bentley, WA 6102, Australia.
Field Crops Pathology, Agriculture Victoria, Horsham, Victoria 3401, Australia.
G3 (Bethesda). 2023 May 2;13(5). doi: 10.1093/g3journal/jkad076.
Spot form net blotch, caused by Pyrenophora teres f. maculata, is a major foliar disease of barley worldwide. Knowledge of the pathogen's genetic diversity and population structure is critical for a better understanding of inherent evolutionary capacity and for the development of sustainable disease management strategies. Genome-wide, single nucleotide polymorphism data of 254 Australian isolates revealed genotypic diversity and an absence of population structure, either between states, or between fields and cultivars in different agro-ecological zones. This indicates there is little geographical isolation or cultivar directional selection and that the pathogen is highly mobile across the continent. However, two cryptic genotypic groups were found only in Western Australia, predominantly associated with genes involved in fungicide resistance. The findings in this study are discussed in the context of current cultivar resistance and the pathogen's adaptive potential.
叶斑病，又称网斑病，由禾谷镰刀菌引起，是一种世界性的大麦叶部病害。了解病原体的遗传多样性和种群结构对于更好地理解其内在进化能力以及制定可持续的疾病管理策略至关重要。对 254 个澳大利亚分离株的全基因组单核苷酸多态性数据进行分析，结果表明，无论是各州之间，还是不同农业生态区的田间和品种之间，都存在基因型多样性和种群结构缺失。这表明地理隔离或品种定向选择很少，病原体在整个大洲具有高度的移动性。然而，在西澳大利亚州仅发现了两个隐性基因型群体，它们主要与杀菌剂抗性相关的基因有关。本研究结果在当前品种抗性和病原体适应潜力的背景下进行了讨论。
