title: Multi-environment analysis and improved mapping of a yield-related QTL on chromosome 3B of wheat.
abstract: 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.
authors.affiliation: Australian Centre for Plant Functional Genomics and School of Agriculture, Food and Wine, Waite Research Institute, University of Adelaide, PMB 1, Glen Osmond, SA, 5064, Australia. Julien.bonneau@acpfg.com.au
authors.forename: Julien
authors.initials: J
authors.lastname: Bonneau
authors.forename: Julian
authors.initials: J
authors.lastname: Taylor
authors.forename: Boris
authors.initials: B
authors.lastname: Parent
authors.forename: Dion
authors.initials: D
authors.lastname: Bennett
authors.forename: Matthew
authors.initials: M
authors.lastname: Reynolds
authors.forename: Catherine
authors.initials: C
authors.lastname: Feuillet
authors.forename: Peter
authors.initials: P
authors.lastname: Langridge
authors.forename: Diane
authors.initials: D
authors.lastname: Mather
mesh_terms: D000483:Alleles; D001315:Australia; D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D055864:Droughts; D004777:Environment; D059647:Gene-Environment Interaction; D005819:Genetic Markers; D005838:Genotype; D006358:Hot Temperature; D008800:Mexico; D010641:Phenotype; D040641:Quantitative Trait Loci; D012621:Seasons; D012641:Selection, Genetic; D014908:Triticum / Q000235:genetics*; D014867:Water / Q000378:metabolism
chemical_list: D005819:Genetic Markers; D014867:Water