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    Quantitative genetic analysis of grain yield in an Australian Brassica napus doubled-haploid population

    Access Status
    Fulltext not available
    Authors
    Raman, R.
    Diffey, Simon
    Carling, J.
    Cowley, R.
    Kilian, A.
    Luckett, D.
    Raman, H.
    Date
    2016
    Type
    Journal Article
    
    Metadata
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    Citation
    Raman, R. and Diffey, S. and Carling, J. and Cowley, R. and Kilian, A. and Luckett, D. and Raman, H. 2016. Quantitative genetic analysis of grain yield in an Australian Brassica napus doubled-haploid population. Crop and Pasture Science. 67 (4): pp. 298-307.
    Source Title
    Crop and Pasture Science
    DOI
    10.1071/CP15283
    ISSN
    1836-0947
    School
    Centre for Crop Disease Management
    URI
    http://hdl.handle.net/20.500.11937/26234
    Collection
    • Curtin Research Publications
    Abstract

    High yield is a major objective in canola-breeding programs. We analysed the genetic determinants controlling variation in grain yield in a doubled-haploid (DH) breeding population derived from a single BC1F1 plant from the cross Skipton/Ag-Spectrum//Skipton (designated as theSAgSpopulation).DHlines were evaluated for flowering time and yield in two replicated trials and exhibited significant genetic variation for both traits. Yield showed negative correlation with flowering time; lines that flowered earlier had higher yield than late-flowering lines.Agenetic linkage map comprising 7716 DArTseq markers was constructed for the SAgS population, and a ‘bin’ map based on 508 discrete single-position (non-cosegregating) marker loci was used for quantitative trait locus (QTL) analysis. We identified 20 QTLs (LOD 2) associated with variation in flowering time and grain yield. Two QTLs (Qy.wwai-A7/Qdtf.wwai-A7/Qfs.wwai-A7 and Qy.wwai-C3a/ Qfs.wwai-C3a) appeared repeatedly across experiments, accounting for 4.9–19%of the genotypic variation in flowering time and yield and were located on chromosomes A07 and C03. We identified 22 putative candidate genes for flowering time as well as grain yield, and all were located in a range of 935 bp to 2.97 Mb from markers underlying QTLs. This research provides useful information to be used for breeding high-yielding canola varieties by combining favourable alleles for early flowering and higher grain yield at loci on chromosomes A07, C03 and possibly on A06.

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