title: High density mapping and haplotype analysis of the major stem-solidness locus SSt1 in durum and common wheat.
abstract: Breeding for solid-stemmed durum (Triticum turgidum L. var durum) and common wheat (Triticum aestivum L.) cultivars is one strategy to minimize yield losses caused by the wheat stem sawfly (Cephus cinctus Norton). Major stem-solidness QTL have been localized to the long arm of chromosome 3B in both wheat species, but it is unclear if these QTL span a common genetic interval. In this study, we have improved the resolution of the QTL on chromosome 3B in a durum (Kofa/W9262-260D3) and common wheat (Lillian/Vesper) mapping population. Coincident QTL (LOD = 94-127, R2 = 78-92%) were localized near the telomere of chromosome 3BL in both mapping populations, which we designate SSt1. We further examined the SSt1 interval by using available consensus maps for durum and common wheat and compared genetic to physical intervals by anchoring markers to the current version of the wild emmer wheat (WEW) reference sequence. These results suggest that the SSt1 interval spans a physical distance of 1.6 Mb in WEW (positions 833.4-835.0 Mb). In addition, minor QTL were identified on chromosomes 2A, 2D, 4A, and 5A that were found to synergistically enhance expression of SSt1 to increase stem-solidness. These results suggest that developing new wheat cultivars with improved stem-solidness is possible by combining SSt1 with favorable alleles at minor loci within both wheat species.
authors.affiliation: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada.
authors.forename: Kirby T
authors.initials: KT
authors.lastname: Nilsen
authors.affiliation: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada.
authors.forename: Amidou
authors.initials: A
authors.lastname: N'Diaye
authors.affiliation: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada.
authors.forename: P R
authors.initials: PR
authors.lastname: MacLachlan
authors.affiliation: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada.
authors.forename: John M
authors.initials: JM
authors.lastname: Clarke
authors.affiliation: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada.|Swift Current Research and Development Centre, Agriculture and Agri-Food Canada, Swift Current, SK, Canada.
authors.forename: Yuefeng
authors.initials: Y
authors.lastname: Ruan
authors.affiliation: Swift Current Research and Development Centre, Agriculture and Agri-Food Canada, Swift Current, SK, Canada.
authors.forename: Richard D
authors.initials: RD
authors.lastname: Cuthbert
authors.affiliation: Swift Current Research and Development Centre, Agriculture and Agri-Food Canada, Swift Current, SK, Canada.
authors.forename: Ron E
authors.initials: RE
authors.lastname: Knox
authors.affiliation: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada.
authors.forename: Krystalee
authors.initials: K
authors.lastname: Wiebe
authors.affiliation: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada.
authors.forename: Aron T
authors.initials: AT
authors.lastname: Cory
authors.affiliation: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada.
authors.forename: Sean
authors.initials: S
authors.lastname: Walkowiak
authors.affiliation: Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada.
authors.forename: Brian L
authors.initials: BL
authors.lastname: Beres
authors.affiliation: Lethbridge Research and Development Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Graf
authors.affiliation: Swift Current Research and Development Centre, Agriculture and Agri-Food Canada, Swift Current, SK, Canada.
authors.forename: Fran R
authors.initials: FR
authors.lastname: Clarke
authors.affiliation: Global Institute of Food Security, University of Saskatchewan, 110 Gymnasium Place Saskatoon, SK, Canada.
authors.forename: Andrew G
authors.initials: AG
authors.lastname: Sharpe
authors.affiliation: Department of Molecular Biology and Ecology of Plants, Tel Aviv University, Tel Aviv, Israel.
authors.forename: Assaf
authors.initials: A
authors.lastname: Distelfeld
authors.affiliation: Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada.
authors.forename: Curtis J
authors.initials: CJ
authors.lastname: Pozniak
mesh_terms: D017343:Genes, Plant; D006239:Haplotypes; D040641:Quantitative Trait Loci; D013045:Species Specificity; D014908:Triticum / Q000145:classification / Q000235:genetics*