Collapse of species boundaries in the wild potato Solanum brevicaule complex (Solanaceae, S. sect. Petota): molecular data.

摘要

The Solanum brevicaule complex is a group of morphologically very similar wild and cultivated potato taxa (Solanum sect. Petota). This study uses single to low-copy nuclear RFLPs and RAPDs to investigate their species boundaries and relationships. Atotal of 196 accessions were examined: 154 accessions of 31 taxa of the S. brevicaule complex, and 42 accessions of 14 putative outgroups. Cladistic analyses of both data sets are largely concordant with each other and with recently published phenetic analyses of the same accessions (145 out of 196 accessions were identical) using morphology. The accessions were chosen to represent a geographically well dispersed sample and include material from Peru, Bolivia and Argentina. All three data sets separatemembers of the complex into populations from Peru and immediately adjacent northwestern Bolivia, including most cultivated species accessions, and populations from northwestern Bolivia to Argentina. The molecular results suggest that the complex is paraphyletic as currently circumscribed. Many species of the S. brevicaule complex should be relegated to synonymy.