Multi-environment analysis and improved mapping of a yield-related QTL on chromosome 3B of wheat
Bonneau, Julien, J. | Taylor, Julian, J. | Parent, Boris | Bennett, Dion, D. | Reynolds, Matthew, M. | Feuillet, Catherine, C. | Langridge, Peter, P. | Mather, Diane, D. | Génétique Diversité et Ecophysiologie des Céréales (GDEC) ; Institut National de la Recherche Agronomique (INRA)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP) | Waite Res Inst, Australian Ctr Plant Funct Genom ; University of Adelaide | Waite Res Inst, Sch Agr Food & Wine ; University of Adelaide | International Maize and Wheat Improvement Center (CIMMYT) ; Consultative Group on International Agricultural Research [CGIAR] (CGIAR) | Grain Research and Development Corporation; Australian Research Council; Government of South Australia; University of Adelaide
Improved mapping, multi-environment quantitative trait loci (QTL) analysis and dissection of allelic effects were used to define a QTL associated with grain yield, thousand grain weight and early vigour on chromosome 3BL of bread wheat (Triticum aestivum L.) under abiotic stresses. The QTL had pleiotropic effects and showed QTL x environment interactions across 21 diverse environments in Australia and Mexico. The occurrence and the severity of water deficit combined with high temperatures during the growing season affected the responsiveness of this QTL, resulting in a reversal in the direction of allelic effects. The influence of this QTL can be substantial, with the allele from one parent (RAC875) increasing grain yield by up to 12.5 % (particularly in environments where both heat and drought stress occurred) and the allele from the other parent (Kukri) increasing grain yield by up to 9 % in favourable environments. With the application of additional markers and the genotyping of additional recombinant inbred lines, the genetic map in the QTL region was refined to provide a basis for future positional cloning.
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