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Master Thesis

Précision de la sélection génomique dans des populations constituées de matériel élite et de ressources génétiques chez le pommier

Abstract : European apple cultivation is based on a small number of elite cultivars. These cultivars are becoming increasingly vulnerable in the current climate change context because of their reduced diversity and narrow genetic base. Genetic resources may be a source of favorable alleles that are absent from elite material and thus the transfer of such alleles from genetic resources to elite material could help solve this problem. Genomic selection has been proposed to achieve this goal. This study aims to assess the accuracy of genomic prediction of elite material and genetic resources. We have used high density genotypic data (303239 SNPs) and populations of 847 to 1025 individuals. The characterization of the two populations using genotypic data showed a very weak differentiation (Fst = 0.004) between elite material and genetic resources. On the other hand, differences in minor allele frequencies (MAF) were observed throughout the genome of the two populations. Elite material has a weak family structure, while genetic resources show no structure. The GBLUP model and the cross-validation approach were applied to estimate the accuracy of predictions for seven phenotypic traits assessed in the two populations. The range of variation of all calculated accuracies ranged from 0.23 to 0.82. Accuracies were higher for elite material than for genetic resources for three traits, with a mean difference ranging from 0.1 to 0.18, and higher for genetic resources than for elite material for two traits, with a mean difference ranging from 0.09 to 0.18. The two remaining traits obtained almost similar accuracies for the two populations. The low accuracies obtained for five of the seven traits indicates the need to improve accuracy by increasing the number of individuals.
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https://dumas.ccsd.cnrs.fr/dumas-03032931
Contributor : Montpellier Supagro <>
Submitted on : Tuesday, December 1, 2020 - 10:22:29 AM
Last modification on : Sunday, December 6, 2020 - 3:21:31 AM

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2020_APIMET_Diouf.pdf
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  • HAL Id : dumas-03032931, version 1

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Babacar Diouf. Précision de la sélection génomique dans des populations constituées de matériel élite et de ressources génétiques chez le pommier. Agronomie. 2020. ⟨dumas-03032931⟩

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