Tepe, Eric , Bohs, Lynn .
Relationships among wild relatives of the potato: the Potato clade of the genus Solanum (Solanaceae).
With ca. 250 species, the informally named Potato clade represents one of the larger subgroups of the enormous genus Solanum. Because its members include the potato (Solanum tuberosum), tomato (S. lycopersicum), and pepino (S. muricatum), it is the most economically important clade in the genus. Species of the clade are native throughout the Americas, but diversity is highest in the Andes of Ecuador and Peru. The tomato, potato, and pepino, along with their closest relatives, have been studied intensively, but relationships among other members of the clade have received little attention. In this study, we used sequences from the nuclear ITS and waxy (GBSSI) and plastid trnT-trnF and trnS-trnG to estimate a phylogeny and further explore relationships within the Potato clade, including the affinity of the enigmatic species S. oxycoccoides. With increased sampling over past studies, the Potato clade emerges as a strongly supported monophyletic group (1.0 Bayesian posterior probability and 99% bootstrap) and comprises six to seven subclades which, for the most part, correspond to traditionally recognized sections. These are, in turn, organized into two major subclades: (i) sections Herpystichum and Pteroidea, and (ii) sections Anarrhichomenum, Basarthrum, Etuberosum, Juglandifolia, Lycopersicoides, Lycopersicon, and Petota. As in all other studies including the segroups, sections Etuberosum, Juglandifolia, Lycopersicoides, Lycopersicon, and Petota form a strongly supported monophyletic group. Solanum oxycoccoides, a high-elevation species endemic to north central Peru, was tentatively included in sect. Anarrhichomenum based on morphological evidence, but instead appears to be sister to the second major subclade.
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1 - University of Cincinnati, Department of Biological Sciences, 614 Rieveschl Hall, Cincinnati, OH, 45221, USA
2 - University Of Utah, Department Of Biology, 257 SOUTH 1400 EAST, Salt Lake City, UT, 84112-0840, USA
Presentation Type: Poster:Posters for Sections
Location: Battelle South/Convention Center
Date: Monday, July 9th, 2012
Time: 5:30 PM