title: Genome-Wide Association Mapping for Resistance to Leaf and Stripe Rust in Winter-Habit Hexaploid Wheat Landraces.
abstract: Leaf rust, caused by Puccinia triticina (Pt), and stripe rust, caused by P. striiformis f. sp. tritici (Pst), are destructive foliar diseases of wheat worldwide. Breeding for disease resistance is the preferred strategy of managing both diseases. The continued emergence of new races of Pt and Pst requires a constant search for new sources of resistance. Here we report a genome-wide association analysis of 567 winter wheat (Triticum aestivum) landrace accessions using the Infinium iSelect 9K wheat SNP array to identify loci associated with seedling resistance to five races of Pt (MDCL, MFPS, THBL, TDBG, and TBDJ) and one race of Pst (PSTv-37) frequently found in the Northern Great Plains of the United States. Mixed linear models identified 65 and eight significant markers associated with leaf rust and stripe rust, respectively. Further, we identified 31 and three QTL associated with resistance to Pt and Pst, respectively. Eleven QTL, identified on chromosomes 3A, 4A, 5A, and 6D, are previously unknown for leaf rust resistance in T. aestivum.
authors.affiliation: Department of Plant Pathology, North Dakota State University, Fargo, North Dakota, United States of America.
authors.forename: Albert
authors.initials: A
authors.lastname: Kertho
authors.affiliation: Department of Plant Sciences, North Dakota State University, Fargo, North Dakota, United States of America.
authors.forename: Sujan
authors.initials: S
authors.lastname: Mamidi
authors.affiliation: USDA-ARS, Small Grains and Potato Germplasm Research Unit, Aberdeen, Idaho, United States of America.
authors.forename: J Michael
authors.initials: JM
authors.lastname: Bonman
authors.affiliation: Department of Plant Sciences, North Dakota State University, Fargo, North Dakota, United States of America.
authors.forename: Phillip E
authors.initials: PE
authors.lastname: McClean
authors.affiliation: Department of Plant Pathology, North Dakota State University, Fargo, North Dakota, United States of America.
authors.forename: Maricelis
authors.initials: M
authors.lastname: Acevedo
mesh_terms: D001487:Basidiomycota / Q000502:physiology*; D003198:Computer Simulation; D060467:Disease Resistance / Q000235:genetics*; D005819:Genetic Markers; D055106:Genome-Wide Association Study; D005838:Genotype; D016014:Linear Models; D058977:Molecular Sequence Annotation; D010935:Plant Diseases / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide; D025341:Principal Component Analysis; D040641:Quantitative Trait Loci; D036226:Seedlings / Q000235:genetics / Q000382:microbiology; D014908:Triticum / Q000235:genetics* / Q000382:microbiology
chemical_list: D005819:Genetic Markers