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This article in TPG

  1. Vol. 4 No. 1, p. 76-91
    OPEN ACCESS
     
    Received: Dec 19, 2010
    Published: Mar, 2011


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doi:10.3835/plantgenome2010.12.0030

The Genetics of Winterhardiness in Barley: Perspectives from Genome-Wide Association Mapping

  1. Jarislav von Zitzewitz,
  2. Alfonso Cuesta-Marcos,
  3. Federico Condon,
  4. Ariel J. Castro,
  5. Shiaoman Chao,
  6. Ann Corey,
  7. Tanya Filichkin,
  8. Scott P. Fisk,
  9. Lucia Gutierrez,
  10. Kale Haggard,
  11. Ildikó Karsai,
  12. Gary J. Muehlbauer,
  13. Kevin P. Smith,
  14. Otto Veisz and
  15. Patrick M. Hayes*
  1. J. von Zitzewitz, A. Cuesta-Marcos, A. Corey, T. Filichkin, S. Fisk, K. Haggard, P.M. Hayes, Dep. of Crop and Soil Science, Oregon State Univ., Corvallis, OR 97331; J. von Zitzewitz, Programa Nacional de Investigación Cultivos de Secano, Instituto Nacional de Investigación Agropecuaria, Est. Exp. La Estanzuela, Colonia 70000, Uruguay; Federico Condon, Unidad de Recursos Genéticos, Instituto Nacional de Investigación Agropecuaria, Est. Exp. La Estanzuela, Colonia 70000, Uruguay; G. Muehlbauer, K.P. Smith, Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108; I. Karsai, O. Veisz, Agricultural Research Institute of the Hungarian Academy of Sciences, Martonvásár, Hungary; S. Chao, USDA-ARS Biosciences Research Lab, Fargo, ND 58105-5674; A.J. Castro, Departamento de Producción Vegetal, Est. Exp. Dr Mario A. Cassinoni, Facultad de Agronomía, Universidad de la República, Paysandú 60000, Uruguay; L. Gutierrez, Departamento de Biometría, Estadística y Computación, Facultad de Agronomía, Universidad de la República, Montevideo 12900, Uruguay.

Abstract

Winterhardiness is a complex trait that involves low temperature tolerance (LTT), vernalization sensitivity, and photoperiod sensitivity. Quantitative trait loci (QTL) for these traits were first identified using biparental mapping populations; candidate genes for all loci have since been identified and characterized. In this research we used a set of 148 accessions consisting of advanced breeding lines from the Oregon barley (Hordeum vulgare L. subsp vulgare) breeding program and selected cultivars that were extensively phenotyped and genotyped with single nucleotide polymorphisms. Using these data for genome-wide association mapping we detected the same QTL and genes that have been systematically characterized using biparental populations over nearly two decades of intensive research. In this sample of germplasm, maximum LTT can be achieved with facultative growth habit, which can be predicted using a three-locus haplotype involving FR-H1, FR-H2, and VRN-H2. The FR-H1 and FR-H2 LTT QTL explained 25% of the phenotypic variation, offering the prospect that additional gains from selection can be achieved once favorable alleles are fixed at these loci.

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