Using 20 SSR markers well scattered across the 19 grape chromosomes, we analyzed 4,370 accessions of the INRA grape repository at Vassal, mostly cultivars of Vitis vinifera subsp. sativa (3,727), but also accessions of V. vinifera subsp. sylvestris (80), interspecific hybrids (364), and rootstocks (199). The analysis revealed 2,836 SSR single profiles: 2,323 sativa cultivars, 72 wild individuals (sylvestris), 306 interspecific hybrids, and 135 rootstocks, corresponding to 2,739 different cultivars in all. A total of 524 alleles were detected, with a mean of 26.20 alleles per locus. For the 2,323 cultivars of V. vinifera, 338 alleles were detected with a mean of 16.9 alleles per locus. The mean genetic diversity (GDI) was 0.797 and the level of heterozygosity was 0.76, with broad variation from 0.20 to 1. Interspecific hybrids and rootstocks were more heterozygous and more diverse (GDI = 0.839 and 0.865, respectively) than V. vinifera cultivars (GDI = 0.769), Vitis vinifera subsp. sylvestris being the least divergent with GDI = 0.708. Principal coordinates analysis distinguished the four groups. Slight clonal polymorphism was detected. The limit between clonal variation and cultivar polymorphism was set at four allelic differences out of 40. SSR markers were useful as a complementary tool to traditional ampelography for cultivar identification. Finally, a set of nine SSR markers was defined that was sufficient to distinguish 99.8% of the analyzed accessions. This set is suitable for routine characterization and will be valuable for germplasm management.
Resume-Vitis vinifera est la seule espece endemique de vigne en Europe. Le compartiment sauvage Vitis vinifera subspecies silvestris a subi une forte erosion et seuls quelques peuplements subsistent encore actuellement. Afin de mieux connaitre les relations entre les compartiments sauvage et cultive, nous avons engage une etude de la diversite de populations naturelles. Une population de vignes sauvages du Pic Saint-Loup (Herault) a ainsi ete caracterisee. La cartographie de cette population constituee d'une quinzaine d'individus ainsi que quelques caracteristiques biologiques sont presentees. Le caractere dioique de la plupart des accessions a ete confirme avec une presence importante de pieds males (58 %). La diversite des individus est discutee et comparee a. l'aide de differentes approches : etude morphometrique des feuilles (ampelometrie), polymorphisme moleculaire a. l'aide de dix locus microsatellites, degre de tolerance a. l'oidium (Uncinula necator) et au phylloxera. Dans le cas des marqueurs moleculaires, les donnees sont comparees aux resultats ob tenus sur un echantillon incluant les principaux cepages cultives et autochtones presents dans la region. L'analyse en composantes principales realisee a. partir de ces donnees fait apparaitre une separation tres nette des individus sauvages par rapport aux individus cultives.
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