Genome-Wide Association Study for Spot Blotch Resistance in Synthetic Hexaploid Wheat

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...

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Published inGenes Vol. 13; no. 8; p. 1387
Main Authors Lozano-Ramirez, Nerida, Dreisigacker, Susanne, Sansaloni, Carolina P, He, Xinyao, Sandoval-Islas, José Sergio, Pérez-Rodríguez, Paulino, Carballo, Aquiles Carballo, Diaz, Cristian Nava, Kishii, Masahiro, Singh, Pawan K
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.08.2022
MDPI
Subjects
Analysis
Chromosomes
Climate change
Disease
Diseases
Experiments
foliar disease
Genetic aspects
Genome-wide association studies
genome-wide association study
Genomes
Genomics
Germplasm
Medical screening
Methods
partial least squares regression
Pathogens
Plant breeding
Seeds
Spot blotch
synthetic hexaploid wheat
Wheat
Mexico
South Asia
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Summary: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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ISSN:2073-4425
2073-4425
DOI:10.3390/genes13081387