Genome wide association study reveals novel QTL for barley yellow dwarf virus resistance in wheat

作者：Shormin Choudhury, P. J. Larkin, Rugen Xu, Matthew Hayden, Kerrie Forrest, Holger Meinke, Hongliang Hu, Meixue Zhou, Yun Fan · 发表于：BMC Genomics · 年份：2019 · DOI：10.1186/s12864-019-6249-1 · 被引用次数：27 · 研究领域：Wheat and Barley Genetics and Pathology、Genetic Mapping and Diversity in Plants and Animals、Plant Virus Research Studies

BACKGROUND: Barley yellow dwarf (BYD) is an important virus disease that causes significant reductions in wheat yield. For effective control of Barley yellow dwarf virus through breeding, the identification of genetic sources of resistance is key to success. In this study, 335 geographically diverse wheat accessions genotyped using an Illumina iSelect 90 K single nucleotide polymorphisms (SNPs) bead chip array were used to identify new sources of resistance to BYD in different environments. RESULTS: A genome-wide association study (GWAS) performed using all the generalised and mixed linkage models (GLM and MLM, respectively) identified a total of 36 significant marker-trait associations, four of which were consistently detected in the K model. These four novel quantitative trait loci (QTL) were identified on chromosomes 2A, 2B, 6A and 7A and associated with markers IWA3520, IWB24938, WB69770 and IWB57703, respectively. These four QTL showed an additive effect with the average visual symptom score of the lines containing resistance alleles of all four QTL being much lower than those with less favorable alleles. Several Chinese landraces, such as H-205 (Baimazha) and H-014 (Dahongmai) which have all four favorable alleles, showed consistently higher resistance in different field trials. None of them contained the previously described Bdv2, Bdv3 or Bdv4 genes for BYD resistance. CONCLUSIONS: This study identified multiple novel QTL for BYD resistance and some resistant wheat gen...