Genome-wide association mapping of Fusarium head blight resistance in contemporary barley breeding germplasm

Article

Massman, J., Cooper, B., Horsley, R., Neate, S., Dill-Macky, R., Chao, S., Dong, Y., Schwarz, P., Muehlbauer, G. J. and Smith, K. P.. 2011. "Genome-wide association mapping of Fusarium head blight resistance in contemporary barley breeding germplasm." Molecular Breeding: new strategies in plant improvement. 27 (4), pp. 439-454. https://doi.org/10.1007/s11032-010-9442-0
Article Title

Genome-wide association mapping of Fusarium head blight resistance in contemporary barley breeding germplasm

ERA Journal ID2621
Article CategoryArticle
AuthorsMassman, J. (Author), Cooper, B. (Author), Horsley, R. (Author), Neate, S. (Author), Dill-Macky, R. (Author), Chao, S. (Author), Dong, Y. (Author), Schwarz, P. (Author), Muehlbauer, G. J. (Author) and Smith, K. P. (Author)
Journal TitleMolecular Breeding: new strategies in plant improvement
Journal Citation27 (4), pp. 439-454
Number of Pages17
Year2011
Place of PublicationDordrecht, Netherlands
ISSN1380-3743
1572-9788
Digital Object Identifier (DOI)https://doi.org/10.1007/s11032-010-9442-0
Web Address (URL)http://link.springer.com/article/10.1007%2Fs11032-010-9442-0
Abstract

Utilization of quantitative trait loci (QTL) identified in bi-parental mapping populations has had limited success for improving complex quantitative traits with low to moderate heritability. Association mapping in contemporary breeding germplasm may lead to more effective marker strategies for crop improvement. To test this approach, we conducted association mapping of two complex traits with moderate heritability; Fusarium head blight (FHB) severity and the grain concentration of mycotoxin associated with disease, deoxynivalenol (DON). To map FHB resistance in barley, 768 breeding lines were evaluated in 2006 and 2007 in four locations. All lines were genotyped with 1,536 SNP markers and QTL were mapped using a mixed model that accounts for relatedness among lines. Average linkage disequilibrium within the breeding germplasm extended beyond 4 cM. Four QTL were identified for FHB severity and eight QTL were identified for the DON concentration in two independent sets of breeding lines. The QTL effects were small, explaining 1–3% of the phenotypic variation, as might be expected for complex polygenic traits. We show that using breeding germplasm to map QTL can complement bi-parental mapping studies by providing independent validation, mapping QTL with more precision, resolving questions of linkage and pleiotropy, and identifying genetic markers that can be applied immediately in crop improvement.

Keywordsdisease resistance; Fusarium head blight; Deoxynivalenol quantitative trait loci; association mapping; linkage disequilibrium; barley
ANZSRC Field of Research 2020310506. Gene mapping
300409. Crop and pasture protection (incl. pests, diseases and weeds)
300406. Crop and pasture improvement (incl. selection and breeding)
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Byline AffiliationsUniversity of Minnesota, United States
Busch Agricultural Resources, United States
North Dakota State University, United States
Department of Agriculture, United States
Institution of OriginUniversity of Southern Queensland
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