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Spot blotch (SB) caused by Bipolaris sorokiniana (Sacc.) Shoem is a destructive fungal disease affecting wheat and many other crops. Synthetic hexaploid wheat (SHW) offers opportunities to explore new resistance genes for SB for introgression into elite bread wheat. The objectives of our study were to evaluate a collection of 441 SHWs for resistance to SB and to identify potential new genomic regions associated with the disease. The panel exhibited high SB resistance, with 250 accessions showing resistance and 161 showing moderate resistance reactions. A genome-wide association study (GWAS) revealed a total of 41 significant marker-trait associations for resistance to SB, being located on chromosomes 1B, 1D, 2A, 2B, 2D, 3A, 3B, 3D, 4A, 4D, 5A, 5D, 6D, 7A, and 7D; yet none of them exhibited a major phenotypic effect. In addition, a partial least squares regression was conducted to validate the marker-trait associations, and 15 markers were found to be most important for SB resistance in the panel. To our knowledge, this is the first GWAS to investigate SB resistance in SHW that identified markers and resistant SHW lines to be utilized in wheat breeding.
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Journal
Genes
Journal volume
13
Journal issue
8
Article number
1387
Place of Publication
Basel (Switzerland)
Publisher
MDPI
Related Datasets
CGIAR Initiatives
Initiative
Accelerated Breeding
Genebanks
Genebanks
Impact Area
Nutrition, health & food security
Environmental health & biodiversity
Environmental health & biodiversity
Action Area
Genetic Innovation
Donor or Funder
CGIAR Research Program on Wheat
United States Agency for International Development (USAID)
Accelerating Genetic Gains in Maize and Wheat for Improved Livelihoods (AGG)
United States Agency for International Development (USAID)
Accelerating Genetic Gains in Maize and Wheat for Improved Livelihoods (AGG)