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

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DOIResolve DOI: https://doi.org/10.1007/s13353-015-0302-9
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Name affiliation
  1. National Research Council of Canada. Aquatic and Crop Resource Development
FormatText, Article
Journal titleJournal of Applied Genetics
ISSN1234-1983
2190-3883
Volume57
Issue1
Pages27–36
Subjectallelism; genetic analyses; Puccinia coronata; seedling resistance
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.
Publication date
PublisherSpringer
LanguageEnglish
Peer reviewedYes
NPARC number21277065
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