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Open Access item Yield QTL affected by heading date in Mediterranean grown barley

Authors:Cuesta-Marcos, Alfonso
Casas Cendoya, Ana María
Hayes, Patrick M.
Gracia Gimeno, María Pilar
Lasa Dolhagaray, José Manuel
Ciudad, Francisco J.
Codesal, Primitiva
Molina-Cano, José Luis
Igartua Arregui, Ernesto
Keywords:Barley, Yield, Heading date, QTL, Mediterranean
Issue Date:Feb-2009
Publisher:Blackwell Publishing
Citation:Plant Breeding, Volume 128 (2009), Issue 1, Pages 46 - 53
Abstract:Knowledge regarding quantitative trait loci (QTL) has led to remarkable advances in breeding for a variety of traits, some of which have an effect on yield under particular environmental conditions. However, the same yield QTL are not usually found, even in the same population tested in different environments, as a result of large genotype-by-environment interactions. In this study, we aimed at identifying yield QTL in a series of experiments carried out in Spain. We used a barley doubled haploid population derived from a spring by winter cross. The relationship between heading date and yield, and between the principal heading date QTL and yield, changed depending on the environment. Allelic combinations causing early or late heading dates usually did not favour high yield, whereas intermediate heading dates were associated with not only higher variability but also higher yield potential. To identify QTL for grain yield independent of heading date, the population was divided into three classes: Early, Intermediate and Late. We found three new QTL affecting yield only at specific maturity groups. The implications of these findings in relation to barley breeding are discussed.
Description:The definitive version is available at www.blackwell-synergy.com
Publisher version (URL):http://www3.interscience.wiley.com/cgi-bin/fulltext/121581714/HTMLSTART
ISSN:0179-9541 (printed)
1439-0523 (electronic)
Appears in Collections:(EEAD) Artículos
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