Integrated QTL detection for key breeding traits in multiple peach progenies
Hernández Mora, José R.
Van de Weg, Eric
Dettori, Maria Teresa
Campoy, José Antonio
Aranzana, Maria José
Background: Peach (Prunus persica (L.) Batsch) is a major temperate fruit crop with an intense breeding activity.Breeding is facilitated by knowledge of the inheritance of the key traits that are often of a quantitative nature. QTLs have traditionally been studied using the phenotype of a single progeny (usually a full-sib progeny) and the correlation with a set of markers covering its genome. This approach has allowed the identification of various genes and QTLs but is limited by the small numbers of individuals used and by the narrow transect of the variability analyzed. In this article we propose the use of a multi-progeny mapping strategy that used pedigree information and Bayesian approaches that supports a more precise and complete survey of the available genetic variability. Results: Seven key agronomic characters (data from 1 to 3 years) were analyzed in 18 progenies from crosses between occidental commercial genotypes and various exotic lines including accessions of other Prunus species. A total of 1467 plants from these progenies were genotyped with a 9 k SNP array. Forty-seven QTLs were identified, 22 coinciding with major genes and QTLs that have been consistently found in the same populations when studied individually and 25 were new. A substantial part of the QTLs observed (47%) would not have been detected in crosses between only commercial materials, showing the high value of exotic lines as a source of novel alleles for the commercial gene pool. Our strategy also provided estimations on the narrow sense heritability of each character, and the estimation of the QTL genotypes of each parent for the different QTLs and their breeding value. Conclusions: The integrated strategy used provides a broader and more accurate picture of the variability available for peach breeding with the identification of many new QTLs, information on the sources of the alleles of interest and the breeding values of the potential donors of such valuable alleles. These results are first-hand information for breeders and a step forward towards the implementation of DNA-informed strategies to facilitate selection of new cultivars with improved productivity and quality.
633 - Cultius i produccions
Is part of
Hernández Mora, José R., Diego Micheletti, Marco Bink, Eric Van de Weg, Celia Cantín, Nelson Nazzicari, and Andrea Caprera et al. 2017. "Integrated QTL Detection For Key Breeding Traits In Multiple Peach Progenies". BMC Genomics 18 (1). doi:10.1186/s12864-017-3783-6.
Grant agreement number
EC/FP7/265582/EU/Integrated approach for increasing breeding efficiency in fruit tree crops/FRUIT BREEDOMICS
MINECO/Programa Estatal de I+D+I orientada a los retos de la sociedad/AGL2015-68329-R/ES/IDENTIFICACION Y CARACTERIZACION DE GENES IMPLICADOS EN LA FORMA Y JUGOSIDAD DEL FRUTO EN MELOCOTONERO Y ALMENDRO/
MINECO/Programa Estatal de fomento de la investigación científica y técnica de excelencia/SEV-2015-0533/ES/ /
Genòmica i Biotecnologia
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- ARTICLES CIENTÍFICS 
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