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Resistance to powdery mildew in Spanish barley landraces is controlled by different sets of quantitative trait loci

Abstract

Twenty-two landrace-derived inbred lines from the Spanish Barley Core Collection (SBCC) were found to display high levels of resistance to a panel of 27 isolates of the fungus Blumeria graminis that exhibit a wide variety of virulences. Among these lines, SBCC145 showed high overall resistance and a distinctive spectrum of resistance compared with the other lines. Against this background, the main goal of the present work was to investigate the genetic basis underlying such resistance using a doubled haploid population derived from a cross between SBCC145 and the elite spring cultivar Beatrix. The population was genotyped with the 1,536-SNP Illumina GoldenGate Oligonucleotide Pool Assay (Barley OPA-1 or BOPA1 for short), whereas phenotypic analysis was performed using two B. graminis isolates. A major quantitative trait locus (QTL) for resistance to both isolates was identified on the long arm of chromosome 6H (6HL) and accounted for ca. 60% of the phenotypic variance. Depending on the B. graminis isolate tested, three other minor QTLs were detected on chromosomes 2H and 7H, which explained less than 5% of the phenotypic variation each. In all cases, the alleles for resistance derived from the Spanish parent SBCC145. The position, the magnitude of the effect observed and the proportion of phenotypic variation accounted for by the QTL on 6HL suggest this is a newly identified locus for broad-based resistance to powdery mildew.

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Acknowledgments

This work was funded by the Spanish Ministry of Science and Innovation (projects GEN2006-28560-E, AGL2007-63625 and Plant-KBBE ExpResBar, EUI2009-04075) and co-funded by the European Regional Development Fund. CS holds an I3P postdoctoral contract from CSIC. CS was supported by mobility fellowships from the Deutsche Forschungsgemeinschaft (DFG), CSIC, Fundación Caja Inmaculada and COST Action FA0604 (Tritigen).

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Correspondence to E. Igartua.

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Communicated by P. Hayes.

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Silvar, C., Casas, A.M., Igartua, E. et al. Resistance to powdery mildew in Spanish barley landraces is controlled by different sets of quantitative trait loci. Theor Appl Genet 123, 1019 (2011). https://doi.org/10.1007/s00122-011-1644-2

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Keywords

  • Quantitative Trait Locus
  • Powdery Mildew
  • Doubled Haploid
  • Quantitative Trait Locus Analysis
  • Doubled Haploid Line