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Genome-wide association mapping of yield and yield components of spring wheat under contrasting moisture regimes

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A stable QTL that may be used in marker-assisted selection in wheat breeding programs was detected for yield, yield components and drought tolerance-related traits in spring wheat association mapping panel.

Abstract

Genome-wide association mapping has become a widespread method of quantitative trait locus (QTL) identification for many crop plants including wheat (Triticum aestivum L.). Its benefit over traditional bi-parental mapping approaches depends on the extent of linkage disequilibrium in the mapping population. The objectives of this study were to determine linkage disequilibrium decay rate and population structure in a spring wheat association mapping panel (n = 285–294) and to identify markers associated with yield and yield components, morphological, phenological, and drought tolerance-related traits. The study was conducted under fully irrigated and rain-fed conditions at Greeley, CO, USA and Melkassa, Ethiopia in 2010 and 2011 (five total environments). Genotypic data were generated using diversity array technology markers. Linkage disequilibrium decay rate extended over a longer genetic distance for the D genome (6.8 cM) than for the A and B genomes (1.7 and 2.0 cM, respectively). Seven subpopulations were identified with population structure analysis. A stable QTL was detected for grain yield on chromosome 2DS both under irrigated and rain-fed conditions. A multi-trait region significant for yield and yield components was found on chromosome 5B. Grain yield QTL on chromosome 1BS co-localized with harvest index QTL. Vegetation indices shared QTL with harvest index on chromosome 1AL and 5A. After validation in relevant genetic backgrounds and environments, QTL detected in this study for yield, yield components and drought tolerance-related traits may be used in marker-assisted selection in wheat breeding programs.

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Acknowledgments

This research was conducted with the financial support from Beachell-Borlaug International Scholarship award to the first author.

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The authors declare that they have no conflict of interest.

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This experiment complies with the current laws of the US and Ethiopia where the experiment was performed.

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Authors and Affiliations

  1. Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO, 80523, USA

    Erena A. Edae, Patrick F. Byrne & Scott D. Haley

  2. CIMMYT, Int., Apdo. Postal 6-641, 06600, Mexico, DF, Mexico

    Marta S. Lopes & Matthew P. Reynolds

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  1. Erena A. Edae
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  2. Patrick F. Byrne
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  3. Scott D. Haley
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  4. Marta S. Lopes
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Correspondence to Erena A. Edae.

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Communicated by A. Grane.

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Edae, E.A., Byrne, P.F., Haley, S.D. et al. Genome-wide association mapping of yield and yield components of spring wheat under contrasting moisture regimes. Theor Appl Genet 127, 791–807 (2014). https://doi.org/10.1007/s00122-013-2257-8

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