Characterization of genetic loci conferring adult plant resistance to leaf rust and stripe rust in spring wheat.

Full Abstract

Leaf (brown) and stripe (yellow) rusts, caused by Puccinia triticina and Puccinia striiformis, respectively, are fungal diseases of wheat (Triticum aestivum) that cause significant yield losses annually in many wheat-growing regions of the world. The objectives of our study were to characterize genetic loci associated with resistance to leaf and stripe rusts using molecular markers in a population derived from a cross between the rust-susceptible cultivar 'Avocet S' and the resistant cultivar 'Pavon76'. Using bulked segregant analysis and partial linkage mapping with AFLPs, SSRs and RFLPs, we identified 6 independent loci that contributed to slow rusting or adult plant resistance (APR) to the 2 rust diseases. Using marker information available from existing linkage maps, we have identified additional markers associated with resistance to these 2 diseases and established several linkage groups in the 'Avocet S' x 'Pavon76' population. The putative loci identified on chromosomes 1BL, 4BL, and 6AL influenced resistance to both stripe and leaf rust. The loci on chromosomes 3BS and 6BL had significant effects only on stripe rust, whereas another locus, characterized by AFLP markers, had minor effects on leaf rust only. Data derived from Interval mapping indicated that the loci identified explained 53% of the total phenotypic variation (R2) for stripe rust and 57% for leaf rust averaged across 3 sets of field data. A single chromosome recombinant line population segregating for chromosome 1B was used to map Lr46/Yr29 as a single Mendelian locus. Characterization of slow-rusting genes for leaf and stripe rust in improved wheat germplasm would enable wheat breeders to combine these additional loci with known slow-rusting loci to generate wheat cultivars with higher levels of slow-rusting resistance.

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Author information

Author/s: William, H M (HM); Singh, R P (RP); Huerta-Espino, J (J); Palacios, G (G); Suenaga, K (K);

Affiliation: International Maize and Wheat Improvement Center CIMMYT, Apdo-Postal, Mexico. m.william(-atsign-)cgiar.org

Journal and publication information

Publication Type: Journal Article

Journal: Genome / National Research Council Canada = Génome / Conseil national de recherches Canada (Genome), published in Canada. (Language: eng)

Reference: 2006-Aug; vol 49 (issue 8) : pp 977-90

Dates: Created 2006/10/12; Completed 2007/01/25;

PMID: 17036073, status: MEDLINE (last retrieval date: 12/26/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Genetic Markers
Lod Score
Phenotype
Plant Diseases - genetics; microbiology
Quantitative Trait Loci
Triticum - genetics; microbiology

Associated Chemicals: Genetic Markers (0)

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