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How microsatellite diversity helps to understand the domestication history of melon

Abstract : Melon (Cucumis melo L.) population structure remains incomplete because of the sampling weakness in some botanical groups and for wild melons. The purpose of this study was to assess the genetic subdivisions in melon germplasm using a more representative sampling of the worldwide diversity and to investigate the localization of melon domestication and diversification. To reach this objective, a set of 20 microsatellite markers was used to genotype 713 accessions including 635 cultivated and feral melons, 66 wild melons and 12 relative Cucumis sp. A two-level structure in melon was revealed using population genetics statistics, clustering methods with genetic distances and Bayesian assignment method. Accessions split into two groups, fitting very well the subspecie melo and agrestis. Agrestis group was clearly substructured according to geographical origins, with African, Far-Eastern and Indian subgroups. The substructure of melo group was less resolute and the four clusters obtained grouped together several botanical groups originating from Europe, America, Middle East or Central Asia. African and Asian wild Cucumis melo were assigned to two distinct clusters in agrestis group, each with cultivated melons from the same respective geographical origin, suggesting that melon was domesticated twice. The domestication of wild African melon would have had a weak impact on the diversification of cultivated melon producing only Sudanese tibish and seinat types. The domestication of wild Asian melon, probably in india, would have first produced Indian cultivated melons and then be at the origin of Far-Eastern melons. Introduction of Eastern melons in the West and successive breeding activities may have then produced melo ssp. These findings are consistent with recent data on the Cucumis genus structure and origin, and with the high frequency of resistance genes found in melon Indian accessions.
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Submitted on : Wednesday, June 3, 2020 - 12:26:21 PM
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  • HAL Id : hal-02747846, version 1
  • PRODINRA : 208082

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Laurana Serres-Giardi, Catherine Dogimont. How microsatellite diversity helps to understand the domestication history of melon. 10. EUCARPIA Meeting on Genetics and Breeding of Cucurbitaceae, Oct 2012, Antalya, Turkey. 809 p. ⟨hal-02747846⟩

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