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Powdery mildew resistance and Lr34/Yr18 genes for durable resistance to leaf and stripe rust cosegregate at a locus on the short arm of chromosome 7D of wheat

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Abstract

The incorporation of effective and durable disease resistance is an important breeding objective for wheat improvement. The leaf rust resistance gene Lr34 and stripe rust resistance gene Yr18 are effective at the adult plant stage and have provided moderate levels of durable resistance to leaf rust caused by Puccinia triticina Eriks. and to stripe rust caused by Puccinia striiformis Westend. f. sp. tritici. These genes have not been separated by recombination and map to chromosome 7DS in wheat. In a population of 110 F7 lines derived from a Thatcher × Thatcher isogenic line with Lr34/Yr18, field resistance to leaf rust conferred by Lr34 and to stripe rust resistance conferred by Yr18 cosegregated with adult plant resistance to powdery mildew caused by Blumeria graminis (DC) EO Speer f. sp. tritici. Lr34 and Yr18 were previously shown to be associated with enhanced stem rust resistance and tolerance to barley yellow dwarf virus infection. This chromosomal region in wheat has now been linked with resistance to five different pathogens. The Lr34/Yr18 phenotypes and associated powdery mildew resistance were mapped to a single locus flanked by microsatellite loci Xgwm1220 and Xgwm295 on chromosome 7DS.

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Authors and Affiliations

  1. CSIRO Plant Industry, GPO Box 1600, Canberra, ACT, 2601, Australia

    W. Spielmeyer & E. S. Lagudah

  2. Plant Breeding Institute Cobbitty, University of Sydney, Private Mail Bag 11, Camden, NSW, 2570, Australia

    R. A. McIntosh

  3. USDA-ARS Cereal Disease Laboratory, University of Minnesota, 1551 Lindig Ave, St. Paul, MN, 55108, USA

    J. Kolmer

Authors
  1. W. Spielmeyer
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  2. R. A. McIntosh
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  3. J. Kolmer
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  4. E. S. Lagudah
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Correspondence to W. Spielmeyer.

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Communicated by B. Keller

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Spielmeyer, W., McIntosh, R.A., Kolmer, J. et al. Powdery mildew resistance and Lr34/Yr18 genes for durable resistance to leaf and stripe rust cosegregate at a locus on the short arm of chromosome 7D of wheat. Theor Appl Genet 111, 731–735 (2005). https://doi.org/10.1007/s00122-005-2058-9

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  • DOI: https://doi.org/10.1007/s00122-005-2058-9

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