Quantitative trait loci mapping reveals the complexity of adult plant resistance to leaf rust in spring wheat ‘Copio’

dc.creatorRauf, Y.
dc.creatorCaixia Lan
dc.creatorRandhawa, M.S.
dc.creatorSingh, R.P.
dc.creatorHuerta-Espino, J.
dc.creatorAnderson, J.
dc.date2022-04-27T00:20:17Z
dc.date2022-04-27T00:20:17Z
dc.date2022
dc.date.accessioned2023-07-17T20:09:08Z
dc.date.available2023-07-17T20:09:08Z
dc.identifierhttps://hdl.handle.net/10883/22054
dc.identifier10.1002/csc2.20728
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7513819
dc.descriptionThe spring wheat (Triticum aestivum L.) line ‘Copio’ has exhibited high level of adult plant resistance (APR) to the leaf rust (Puccinia triticina) pathogen in Mexico during field evaluations. To elucidate the genetic basis of leaf rust resistance in Copio, 176 F4-derived F6-recombinant inbred lines (RILs) from a cross of wheat lines ‘Apav’ and Copio were phenotyped in the field for two seasons in the United States and Mexico. A total of 762 genotyping-by-sequencing (GBS) single nucleotide polymorphic (SNP) markers were used to develop linkage maps. Composite interval mapping identified seven quantitative trait loci (QTL), all contributed by Copio. Three QTL on chromosome arms 1BL (QLr.umn-1B), 2AS (QLr.umn-2A), and 3BS (QLr.umn-3B) were consistently expressed across all four environments. The QTL on 1BL represents Lr46, which is a pleiotropic APR gene, while the QTL on 2AS is colocated to the Lr37 gene in the 2NS/2AS translocation fragment. The QTL on 3BS, mapped to the Sr2/Yr30/Lr27 genomic region, is more likely to be a unique locus conferring APR to leaf rust races because all phenotyping environments had Lr27 virulent pathotypes. Moreover, the functionality of Lr27 is complimented by Lr31 on chromosome 4BS, which is lacking in both parents. Marker haplotypes identified seven RILs carrying a combination of resistance alleles at all three loci. This combination reduced leaf rust coefficient of infection up to 52 and 36% in the Mexican and U.S. environments, respectively. This study reports the complex genetic mechanism of APR to leaf rust in Copio and its importance as a potential resistance source for gene pyramiding through recombination breeding.
dc.description1037-1050
dc.languageEnglish
dc.publisherWiley
dc.publisherCSSA
dc.relationhttps://acsess.onlinelibrary.wiley.com/doi/10.1002/csc2.20728#support-information-section
dc.relationNutrition, health & food security
dc.relationAccelerated Breeding
dc.relationGenetic Innovation
dc.relationUnited States Agency for International Development
dc.relationCGIAR Trust Fund
dc.relationhttps://hdl.handle.net/10568/130126
dc.rightsCIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose
dc.rightsOpen Access
dc.source3
dc.source62
dc.source0011-183X
dc.sourceCrop Science
dc.subjectAGRICULTURAL SCIENCES AND BIOTECHNOLOGY
dc.subjectPUCCINIA RECONDITA
dc.subjectDISEASE RESISTANCE
dc.subjectSPRING WHEAT
dc.subjectQUANTITATIVE TRAIT LOCI
dc.titleQuantitative trait loci mapping reveals the complexity of adult plant resistance to leaf rust in spring wheat ‘Copio’
dc.typeArticle
dc.typePublished Version
dc.coverageMadison (USA)


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