Szabo-Hever Agnes, Running Katherine L D, Seneviratne Sudeshi, Singh Gurminder, Zhang Zengcui, Peters Haugrud Amanda R, Maccaferri Marco, Tuberosa Roberto, Friesen Timothy L, Xu Steven S, Faris Justin D
Cereal Crops Improvement Research Unit, Edward T. Schafer Agricultural Research Center, USDA-Agricultural Research Service, Fargo, ND 58102, U.S.A.
Department of Plant Sciences, North Dakota State University, Fargo, ND 58102, U.S.A.
Plant Dis. 2025 Apr;109(4):851-861. doi: 10.1094/PDIS-05-24-0990-RE. Epub 2025 Apr 17.
Septoria nodorum blotch (SNB) is an important disease of both durum and hard red spring wheat (HRSW) worldwide. The disease is caused by the necrotrophic fungal pathogen when compatible gene-for-gene interactions occur between pathogen-produced necrotrophic effectors (NEs) and corresponding host sensitivity genes. To date, nine sensitivity gene-NE interactions have been identified, but there is little information available regarding their overall frequency in durum and HRSW. Here, we infiltrated a global HRSW panel (HRSWP) and the Global Durum Panel (GDP) with NEs SnToxA, SnTox1, SnTox267, SnTox3, and SnTox5. Frequencies of sensitivity to SnTox1 and SnTox5 were higher in durum compared with HRSW and vice versa for SnTox267 and SnTox3. Strong associations for the known sensitivity loci , , , , , and along with potentially novel sensitivity loci on chromosome arms 7DS and 3BL, associated with SnToxA and SnTox267, respectively, were identified in the HRSWP. In the GDP, , , and were identified along with novel loci associated with sensitivity to SnTox267 on chromosome arms 2AS, 2AL, and 6AS and with SnTox5 sensitivity on 2BS and 7BL. These results reveal additional NE sensitivity loci beyond those previously described, demonstrating a higher level of genetic complexity of the wheat- system than was previously thought. Knowledge regarding the prevalence and genomic locations of SNB susceptibility genes in HRSW and durum will prove useful for developing efficient breeding strategies and improving varieties for SNB resistance.
颖枯病（SNB）是全球硬粒小麦和硬红春小麦（HRSW）的一种重要病害。当病原菌产生的坏死营养效应子（NEs）与相应的寄主敏感基因之间发生基因对基因的互作时，该病害由坏死营养型真菌病原菌引起。迄今为止，已鉴定出9种敏感基因 - NE互作，但关于它们在硬粒小麦和HRSW中的总体频率的信息很少。在这里，我们用NEs SnToxA、SnTox1、SnTox267、SnTox3和SnTox5对一个全球HRSW群体（HRSWP）和全球硬粒小麦群体（GDP）进行了接种。与HRSW相比，硬粒小麦对SnTox1和SnTox5的敏感频率更高，而对SnTox267和SnTox3则相反。在HRSWP中，鉴定出了与已知敏感位点、、、、、以及分别与SnToxA和SnTox267相关的位于染色体臂7DS和3BL上的潜在新敏感位点有很强的关联。在GDP中，鉴定出了、、，以及与染色体臂2AS、2AL和6AS上对SnTox267的敏感性相关的新位点，以及与2BS和7BL上对SnTox5的敏感性相关的新位点。这些结果揭示了除先前描述的位点之外的其他NE敏感位点，表明小麦 - 系统的遗传复杂性水平比以前认为的更高。关于HRSW和硬粒小麦中颖枯病易感基因的流行情况和基因组位置的知识，将有助于制定有效的育种策略和改良抗颖枯病品种。
