title: Predicting Hybrid Performances for Quality Traits through Genomic-Assisted Approaches in Central European Wheat.
abstract: Bread-making quality traits are central targets for wheat breeding. The objectives of our study were to (1) examine the presence of major effect QTLs for quality traits in a Central European elite wheat population, (2) explore the optimal strategy for predicting the hybrid performance for wheat quality traits, and (3) investigate the effects of marker density and the composition and size of the training population on the accuracy of prediction of hybrid performance. In total 135 inbred lines of Central European bread wheat (Triticum aestivum L.) and 1,604 hybrids derived from them were evaluated for seven quality traits in up to six environments. The 135 parental lines were genotyped using a 90k single-nucleotide polymorphism array. Genome-wide association mapping initially suggested presence of several quantitative trait loci (QTLs), but cross-validation rather indicated the absence of major effect QTLs for all quality traits except of 1000-kernel weight. Genomic selection substantially outperformed marker-assisted selection in predicting hybrid performance. A resampling study revealed that increasing the effective population size in the estimation set of hybrids is relevant to boost the accuracy of prediction for an unrelated test population.
authors.affiliation: Department of Breeding Research, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Stadt Seeland, Germany.
authors.forename: Guozheng
authors.initials: G
authors.lastname: Liu
authors.affiliation: Department of Breeding Research, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Stadt Seeland, Germany.
authors.forename: Yusheng
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: State Plant Breeding Institute, University of Hohenheim, Stuttgart, Germany.
authors.forename: Manje
authors.initials: M
authors.lastname: Gowda
authors.affiliation: State Plant Breeding Institute, University of Hohenheim, Stuttgart, Germany.
authors.forename: C Friedrich H
authors.initials: CF
authors.lastname: Longin
authors.affiliation: Department of Breeding Research, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Stadt Seeland, Germany.
authors.forename: Jochen C
authors.initials: JC
authors.lastname: Reif
authors.affiliation: Department of Breeding Research, Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Stadt Seeland, Germany.
authors.forename: Michael F
authors.initials: MF
authors.lastname: Mette
mesh_terms: D001939:Bread / Q000592:standards; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics; D005060:Europe; D017343:Genes, Plant / Q000235:genetics; D018745:Genome, Plant / Q000235:genetics*; D023281:Genomics / Q000379:methods*; D005838:Genotype; D006823:Hybrid Vigor / Q000235:genetics; D006824:Hybridization, Genetic; D010641:Phenotype; D000069600:Plant Breeding / Q000379:methods; D020641:Polymorphism, Single Nucleotide; D040641:Quantitative Trait Loci / Q000235:genetics*; D013045:Species Specificity; D014908:Triticum / Q000145:classification / Q000235:genetics*