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Genetic analysis of seedling resistance to crown rust in five diploid oat (Avena strigosa) accessions

  • Plant Genetics • Original Paper
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Abstract

Crown rust, caused by Puccinia coronata Corda f. sp. avenae Eriks., is a serious menace in oats, for which resistance is an effective means of control. Wild diploid oat accessions are a source of novel resistances that first need to be characterised prior to introgression into locally adapted oat cultivars. A genetic analysis of resistance to crown rust was carried out in three diverse diploid oat accessions (CIav6956, CIav9020, PI292226) and two cultivars (Saia and Glabrota) of A. strigosa. A single major gene conditioning resistance to Australian crown rust pathotype (Pt) 0000–2 was identified in each of the three accessions. Allelism tests suggested that these genes are either the same, allelic, or tightly linked with less than 1 % recombination. Similarly, a single gene was identified in Glabrota, and possibly two genes in Saia; both cultivars previously reported to carry two and three crown rust resistance genes, respectively. The identified seedling resistance genes could be deployed in combination with other resistance gene(s) to enhance durability of resistance to crown rust in hexaploid oat. Current diploid and hexaploid linkage maps and molecular anchor markers (simple sequence repeat [SSR] and diversity array technology [DArT] markers) should facilitate their mapping and introgression into hexaploid oat.

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Acknowledgments

The author thanks Prof. Robert McIntosh for his comments on the manuscript, and acknowledges funding from the Sir Alexander Hugh Thurburn Faculty Scholarship, University of Sydney and the Grains Research and Development Corporation (GRDC), Australia.

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Authors and Affiliations

  1. Plant Breeding Institute Cobbitty, University of Sydney, Private Bag 4011, Narellan, NSW, 2567, Australia

    A. L. Cabral & R. F. Park

  2. National Research Council of Canada, 110 Gymnasium Place, Saskatoon, SK, S7N 0W9, Canada

    A. L. Cabral

Authors
  1. A. L. Cabral
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  2. R. F. Park
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Correspondence to A. L. Cabral.

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Communicated by: Andrzej Górny

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Supplementary Table S8

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Cabral, A.L., Park, R.F. Genetic analysis of seedling resistance to crown rust in five diploid oat (Avena strigosa) accessions. J Appl Genetics 57, 27–36 (2016). https://doi.org/10.1007/s13353-015-0302-9

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  • DOI: https://doi.org/10.1007/s13353-015-0302-9

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