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Phenotypic diversity and association mapping for fruit quality traits in cultivated tomato and related species
Authors:Jiaxin Xu  Nicolas Ranc  Stéphane Muños  Sophie Rolland  Jean-Paul Bouchet  Nelly Desplat  Marie-Christine Le Paslier  Yan Liang  Dominique Brunel  Mathilde Causse
Institution:1. College of Horticulture, Northwest A&F University, Yang Ling, 712100, Shaanxi, People’s Republic of China
2. Unité de Génétique et Amélioration des Fruits et Légumes, INRA, UR1052, 84143, Avignon, France
4. Syngenta Seeds SAS, 12, chemin de l’Hobit, B.P. 27, 31790, Saint-Sauveur, France
5. Laboratoire des Interactions Plantes Micro-organismes (LIPM), CNRS-INRA, UMR 2594/441, 31326, Castanet-Tolosan Cedex, France
6. Amélioration des Plantes et Biotechnologies Végétales, INRA-AgroCampus Ouest-Université Rennes1, UMR118, BP 35327, 35653, Le Rheu Cedex, France
3. Unité Etude du Polymorphisme des Génomes Végétaux, CEA-Institut de Génomique-CNG, INRA, UR1279, 91057, Evry, France
Abstract:Association mapping has been proposed as an efficient approach to assist in the identification of the molecular basis of agronomical traits in plants. For this purpose, we analyzed the phenotypic and genetic diversity of a large collection of tomato accessions including 44 heirloom and vintage cultivars (Solanum lycopersicum), 127 S. lycopersicum var. cerasiforme (cherry tomato) and 17 Solanum pimpinellifolium accessions. The accessions were genotyped using a SNPlex? assay of 192 SNPs, among which 121 were informative for subsequent analysis. Linkage disequilibrium (LD) of pairwise loci and population structure were analyzed, and the association analysis between SNP genotypes and ten fruit quality traits was performed using a mixed linear model. High level of LD was found in the collection at the whole genome level. It was lower when considering only the 127 S. lycopersicum var. cerasiforme accessions. Genetic structure analysis showed that the population was structured into two main groups, corresponding to cultivated and wild types and many intermediates. The number of associations detected per trait varied, according to the way the structure was taken into account, with 0–41 associations detected per trait in the whole collection and a maximum of four associations in the S. lycopersicum var. cerasiforme accessions. A total of 40 associations (30 %) were co-localized with previously identified quantitative trait loci. This study thus showed the potential and limits of using association mapping in tomato populations.
Keywords:
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