High density mapping and haplotype analysis of the major stem-solidness locus SSt1 in durum and common wheat

Kirby T. Nilsen, Amidou N'Diaye, P. R. MacLachlan, John M. Clarke, Yuefeng Ruan, Richard D. Cuthbert, Ron E. Knox, Krystalee Wiebe, Aron T. Cory, Sean Walkowiak, Brian L. Beres, Robert J. Graf, Fran R. Clarke, Andrew G. Sharpe, Assaf Distelfeld, Curtis J. Pozniak

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article numbere0175285
JournalPLoS ONE
Issue number4
StatePublished - Apr 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 Nilsen et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

ASJC Scopus subject areas

  • General


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