Neupane A, Tamang P, Brueggeman R S, Friesen T L
First, second, and third authors: Department of Plant Pathology, North Dakota State University, Fargo, ND 58108-6050; and fourth author: U.S. Department of Agriculture-Agriculture Research Service, Cereal Crops Research Unit, Northern Crop Science Laboratory, Fargo, ND 58102-2765.
Phytopathology. 2015 Apr;105(4):509-17. doi: 10.1094/PHYTO-04-14-0107-R.
Spot form net blotch (SFNB) caused by Pyrenophora teres f. maculata is a major foliar disease of barley (Hordeum vulgare) worldwide. SFNB epidemics have recently been observed in major barley producing countries, suggesting that the local barley cultivars are not resistant and that virulence of the local pathogen populations may have changed. Here we attempt to identify sources of resistance effective against four diverse isolates of P. teres f. maculata collected from around the world. A total of 2,062 world barley core collection accessions were phenotyped using isolates of the pathogen collected in the United States (FGO), Australia (SG1), New Zealand (NZKF2), and Denmark (DEN 2.6). Isolate-specific susceptibility was identified in several of the barley accessions tested, indicating variability in both pathogen virulence and host resistance/susceptibility. Collectively, only 15 barley accessions were resistant across all isolates tested. These resistant accessions will be used to generate mapping populations and for germplasm development. Future research will involve the characterization of host resistance, pathogen virulence, and the host-pathogen interaction associated with SFNB of barley.
由斑点网斑病菌（Pyrenophora teres f. maculata）引起的斑点型网斑病（SFNB）是全球大麦（Hordeum vulgare）的一种主要叶部病害。近期在主要大麦生产国均观察到了斑点型网斑病的流行，这表明当地的大麦品种不具有抗性，且当地病原菌群体的毒力可能已经发生了变化。在此，我们试图鉴定对从世界各地收集的四种不同的斑点网斑病菌分离株有效的抗性来源。使用在美国（FGO）、澳大利亚（SG1）、新西兰（NZKF2）和丹麦（DEN 2.6）收集的病原菌分离株，对总共2062份世界大麦核心收集种质进行了表型分析。在测试的几个大麦种质中鉴定出了分离株特异性易感性，这表明病原菌毒力和寄主抗性/易感性均存在变异性。总体而言，在所有测试分离株中，仅有15份大麦种质具有抗性。这些抗性种质将用于构建定位群体和种质创新。未来的研究将涉及对大麦斑点型网斑病相关的寄主抗性、病原菌毒力以及寄主-病原菌互作进行表征。
