Genetic structure of European accessions of Solanum dulcamara L. (Solanaceae)

Solanum dulcamara (bittersweet) is one of the few native species of Solanum present in Europe. It is a common weed that occupies a wide range of habitats and is often found in the direct vicinity of cultivated potatoes ( Solanum tuberosum ), where it could transmit diseases. A broad sampling of European S. dulcamara accessions was carried out to gain insight into the population structure and crossing preferences of this species. Three amplified fragment length polymorphism (AFLP ® ) primer combinations generating 288 polymorphic fragments were used to analyze 79 bittersweet accessions (245 individuals). Dendrograms revealed a low level of genetic polymorphism in the bittersweet populations, caused partially by the out-crossing nature of this species.