Abstract
Linkage mapping based on multiple-line crosses is a promising strategy for mapping quantitative trait loci (QTL) underlying important agronomic traits. The main goal of this survey was to study the advantages of QTL mapping across versus within biparental populations using experimental data from three connected sugar beet (Beta vulgaris L.) populations evaluated for beet yield and potassium and sodium content. For the combined analysis across populations, we used two approaches for cofactor selection. In Model A, we assumed identical cofactors for every segregating population. In contrast, in Model B we selected cofactors specific for every segregating population. Model A performed better than Model B with respect to the number of QTL detected and the total proportion of phenotypic variance explained. The QTL analyses across populations revealed a substantially higher number of QTL compared to the analyses of single biparental populations. This clearly emphasizes the potential to increase QTL detection power with a joint analysis across biparental populations.
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Acknowledgments
This research was conducted within the “Biometric and Bioinformatic Tools for Genomic based Plant Breeding” project of the GABI-FUTURE initiative. D.D. Schwegler was supported by DFG within the project “Genetische Architektur der Eigen- versus Testkreuzungsleistung für wichtige agronomische Merkmale beim Roggen” (Grant ID:MI/519/1-1). M. Gowda was supported by BMBF within the HYWHEAT project (Grant ID: FKZ0315945D).
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Schwegler, D.D., Liu, W., Gowda, M. et al. Multiple-line cross quantitative trait locus mapping in sugar beet (Beta vulgaris L.). Mol Breeding 31, 279–287 (2013). https://doi.org/10.1007/s11032-012-9788-6
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DOI: https://doi.org/10.1007/s11032-012-9788-6