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This article in TPG

  1. Vol. 5 No. 3, p. 164-175
    OPEN ACCESS
     
    Received: July 11, 2012
    Published: December 12, 2012


    * Corresponding author(s): nick.tinker@agr.gc.ca
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doi:10.3835/plantgenome2012.07.0015

Quantitative Trait Loci Affecting Oil Content, Oil Composition, and Other Agronomically Important Traits in Oat

  1. Biniam T. Hizbaiab,
  2. K. M. Gardnerac,
  3. C. P. Wighta,
  4. R. K. Dhandad,
  5. S. J. Molnara,
  6. D. Johnsonb,
  7. J. Frégeau-Reida,
  8. W. Yana,
  9. B. G. Rossnageld,
  10. J. B. Hollande and
  11. N. A. Tinker a
  1. a Eastern Cereal and Oilseed Research Centre, Agriculture and Agri-Food Canada (AAFC), 960 Carling Ave., Central Experimental Farm, Ottawa, ON, K1A 0C6, Canada
    b Dep. of Biology, Univ. of Ottawa, 30 Marie Curie St, Ottawa ON, K1N 6N5, Canada
    c Nova Scotia Agricultural College, Truro, NS B2N 5E3
    d Crop Development Centre, 51 Campus Dr., Saskatoon, SK, S7N 5A8, Canada
    e Dep. of Crop Science, North Carolina State Univ., 1238 WIlliams Hall, Raleigh, NC 27695-7620

Abstract

Groat oil content and composition are important determinants of oat (Avena sativa L.) quality. We investigated these traits in a population of 146 recombinant inbred lines from a cross between ‘Dal’ (high oil) and ‘Exeter’ (low oil). A linkage map consisting of 475 Diversity Arrays Technology (DArT) markers spanning 1271.8 cM across 40 linkage groups was constructed. Quantitative trait locus (QTL) analysis for groat oil content and composition was conducted using grain samples grown at Aberdeen, ID, in 1997. Quantitative trait locus analysis for multiple agronomic traits was also conducted using data collected from hill plots and field plots in Ottawa, ON, in 2010. Using simple and composite interval mapping methods, QTLs for oil content, palmitic acid (16:0), stearic acid (18:0), oleic acid (18:1), linoleic acid (18:2), and linolenic acid (18:3) were identified. Two of the loci associated with oil content were associated with all of the fatty acids examined in this study, and most oil-related QTL showed similar patterns of effect on the fatty acid profile. These results suggest the presence of pleiotropic effects on oil-related traits through influences at specific nodes of the oil synthesis pathway. In addition, 12 QTL-associated markers (likely representing nine unique regions) were associated with plant height, heading date, lodging, and protein content.

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Copyright © 2012. Copyright © 2012 Crop Science Society of America

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