Systematics/Phytogeography / Taxonomie/ Section
Tepe, Eric J. , Bohs, Lynn .
Phylogenetic relationships in the Potato Clade of the genus Solanum (Solanaceae).
Previous phylogenetic studies of the enormous genus Solanum have identified 12 to 15 well-supported major clades. One of these, the Potato clade, encompasses ca. 200 to 300 species and includes the tomato (S. lycopersicum), potato (S. tuberosum), and pepino (S. muricatum), making it the most economically important clade in the genus. Species of the Potato clade are found throughout the Americas, but are particularly diverse in the Andes of Peru and Ecuador. In the present study, we used molecular phylogenetic analyses based on ITS, waxy, and trn T-F sequences to further test the monophyly of the Potato clade and to explore the relationships among its members. With greater sampling over previous analyses, the Potato clade still emerges as a strongly supported monophyletic group, and the relationships among its component clades are becoming increasingly clear. Within the Potato clade, three subgroups are strongly supported: (1) section Basarthrum, (2) a clade containing sections Herpysticum and Pteroidea, and (3) a clade composed of two strongly supported subclades that include sections Petota, Etuberosum, and Lycopersicum, and section Anarrhichomenum. The boundaries of sections Herpysticum and Pteroidea are somewhat unclear; however, additional molecular and morphological work that is currently underway may clarify the limits of these sections. The goals of this project are to further test the monophyly of groups within the Potato clade as a basis for further studies, and to identify morphological synapomorphies that define the groups.
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1 - University of Utah, Department of Biology, 257 South 1400 East, Salt Lake City, Utah, 84112, USA
wild potatoes phylogeny
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, July 30th, 2008
Time: 2:00 PM