Location: Cereal Crops ResearchTitle: Genome-wide association mapping of resistance to the foliar diseases septoria nodorum blotch and tan spot in a global winter wheat (Triticum aestivum L.) collection
|PETERS HAUGRUD, AMANDA - Oak Ridge Institute For Science And Education (ORISE)|
|SHI, GONGJUN - North Dakota State University|
|SENEVIRATNE, SUDESHI - North Dakota State University|
|RUNNING, KATHERINE - North Dakota State University|
|SINGH, GURMINDER - North Dakota State University|
|SZABO-HEVER, AGNES - Oak Ridge Institute For Science And Education (ORISE)|
|ACHARYA, KRISHNA - North Dakota State University|
|LIU, ZHAOHUI - North Dakota State University|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 11/1/2022
Publication Date: 12/1/2022
Citation: Peters Haugrud, A., Shi, G., Seneviratne, S., Running, K., Zhang, Z., Singh, G., Szabo-Hever, A., Acharya, K., Friesen, T.L., Liu, Z., Faris, J.D. 2022. Genome-wide association mapping of resistance to the foliar diseases septoria nodorum blotch and tan spot in a global winter wheat (Triticum aestivum L.) collection [abstract]. Plant and Animal Genome 30 Conference. Poster No. PO0549.
Technical Abstract: Septoria nodorum blotch (SNB) and tan spot, caused by the necrotrophic fungal pathogens Parastagonospora nodorum and Pyrenophora tritici-repentis, respectively, are major foliar diseases on wheat (Triticum aestivum L.). Both pathogens produce necrotrophic effectors (NEs) that are known to play significant roles in the development of disease. We evaluated a panel of 264 winter wheat lines representing a large proportion of the global genetic diversity. We found that 38.6, 4.3, 36.7, 39.0, 48.9, and 42.4 % of the lines were sensitive to the NEs Sn/Ptr ToxA, Ptr ToxB, SnTox1, SnTox267, SnTox3, and SnTox5, respectively. We inoculated the panel with fungal spores of five P. nodorum isolates and four P. tritici-repentis isolates and performed genome-wide association mapping to identify genomic regions associated with disease. For SNB, the Snn3-SnTox3 and Tsn1-SnToxA interactions played significant roles in disease development, along with an uncharacterized QTL on chromosome 2A. For tan spot, the Tsc1-Ptr ToxC interaction was associated with disease caused by isolates Pti2 and AR CrossB10, and a novel QTL was identified on chromosome 7D. The Tsn1-ToxA interaction played an important role in SNB development but not in tan spot development. The screening results with purified NEs will be useful for cloning, validation, and marker development of the sensitivity genes Snn3-B1, Snn2, Snn5, Snn6, and Snn7. This work shows the complexity of disease resistance to SNB and tan spot and illustrates that not all of the previously characterized interactions in these pathosystems play a significant role in disease development in winter wheat.