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Combining ability and heterosis under pest epidemics in a broad-based global wheat-breeding population

Author: Ortiz, R.
Author: Wagoire, W.W.
Author: Stolen, O.
Author: Alvarado, G.
Author: Crossa, J.
Year: 2008
ISSN: 0179-9541
Abstract: Wheat breeders rarely apply population improvement schemes or select parental sources according to combining ability and heterotic patterns. They rely on pedigree selection methods for breeding new cultivars. This experiment was undertaken to assess the advantages of using diallel crosses to define combining ability and understand heterosis in a broad-based wheat-breeding population across different environments affected by yellow rust. Sixty-four genotypes derived from a full diallel mating scheme were assessed for grain yield in two contrasting growing seasons at two locations for two consecutive years. Parental genotypes showed significant combining ability for grain yield that was affected by yellow rust and genotype-by-environment (GE) interactions, both of which affected heterosis for grain yield. Significant GE interactions suggested that decentralized selection for specific environments could maximize the use of this wheat germplasm. Cultivar effects and specific heterosis were the most important factors influencing grain yield. Some crosses capitalized on additive genetic variation for grain yield. This research shows the power of available quantitative breeding tools to help breeders choose parental sources in a population improvement programme.
Language: English
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Article
Region: Global
Pages: 222-227
Journal issue: 3
Journal: Plant Breeding
Journal volume: 127
Keywords: Triticum aestivum
Keywords: diallel analysis
Keywords: genotype-by-environment interaction
Keywords: Quantitative genetics
Keywords: Yellow rust

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  • Wheat
    Wheat - breeding, phytopathology, physiology, quality, biotech

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