Genetic analysis of resistance to stripe rust in durum wheat (Triticum turgidum L. Var. Durum)

Stripe rust, caused by the fungal pathogen Puccinia striiformis Westend. f. sp. tritici Eriks, is an important disease of bread wheat (Triticum aestivum L.) worldwide and there is an indication that it may also become a serious disease of durum wheat (T. turgidum L. var. durum). Therefore, we invest...

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Detalhes bibliográficos
Autores: Xue Lin, N’Diaye, A., Walkowiak, S., Nilsen, K., Cory, A., Haile, J., Kutcher, H.R., Ammar, K., Loladze, A., Huerta-Espino, J., Clarke, J.M., Yanye Ruan, Knox, R., Fobert, P., Sharpe, A.G., Pozniak, C.
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2018
País:México
Recursos:Centro Internacional de Mejoramiento de Maíz y Trigo
Repositório:Repositorio Institucional de Publicaciones Multimedia del CIMMYT
OAI Identifier:oai:repository.cimmyt.org:10883/19628
Acesso em linha:https://hdl.handle.net/10883/19628
Access Level:Acceso aberto
Palavra-chave:AGRICULTURAL SCIENCES AND BIOTECHNOLOGY
HARD WHEAT
PLANT DISEASES
RUSTS
DISEASE RESISTANCE
PUCCINIA STRIIFORMIS
QUANTITATIVE TRAIT LOCI
NUCLEOTIDE SEQUENCE
Descrição
Resumo:Stripe rust, caused by the fungal pathogen Puccinia striiformis Westend. f. sp. tritici Eriks, is an important disease of bread wheat (Triticum aestivum L.) worldwide and there is an indication that it may also become a serious disease of durum wheat (T. turgidum L. var. durum). Therefore, we investigated the genetic architecture underlying resistance to stripe rust in adapted durum wheat germplasm. Wheat infection assays were conducted under controlled conditions in Canada and under field conditions in Mexico. Disease assessments were performed on a population of 155 doubled haploid (DH) lines derived from the cross of Kofa (susceptible) and W9262-260D3 (moderately resistant) and on a breeding panel that consisted of 92 diverse cultivars and breeding lines. Both populations were genotyped using the 90K single-nucleotide polymorphism (SNP) iSelect assay. In the DH population, QTL for stripe rust resistance were identified on chromosome 7B (LOD 6.87?11.47) and chromosome 5B (LOD 3.88?9.17). The QTL for stripe rust resistance on chromosome 7B was supported in the breeding panel. Both QTL were anchored to the genome sequence of wild emmer wheat, which identified gene candidates involved in disease resistance. Exome capture sequencing identified variation in the candidate genes between Kofa and W9262-260D3. These genetic insights will be useful in durum breeding to enhance resistance to stripe rust.

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