Molecular Breeding

, Volume 31, Issue 2, pp 279-287

First online:

Multiple-line cross quantitative trait locus mapping in sugar beet (Beta vulgaris L.)

  • Diana D. SchweglerAffiliated withState Plant Breeding Institute, University of Hohenheim
  • , Wenxin LiuAffiliated withCrop Genetics and Breeding Department, China Agricultural University
  • , Manje GowdaAffiliated withState Plant Breeding Institute, University of Hohenheim
  • , Tobias WürschumAffiliated withState Plant Breeding Institute, University of Hohenheim
  • , Britta SchulzAffiliated withKWS SAAT AG
  • , Jochen C. ReifAffiliated withState Plant Breeding Institute, University of Hohenheim Email author 

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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.


QTL mapping Epistasis MC-QTL mapping Sugar beet