Tepe, Eric J. , Bohs, Lynn .
A phylogeny of Solanum sect. Pteroidea (Solanaceae) and its relationships within the Potato Clade.
Solanum sect. Pteroidea is a small section of ten species within the enormous genus Solanum. The affinities of sect. Pteroidea within Solanum have been enigmatic, and some authors have even segregated members of the section as a separate genus. Recent molecular studies, however, have supported the monophyly of sect. Pteroidea and indicated that it is nested deeply within Solanum as member of the Potato Clade along with potato (S. tuberosum), tomato (S. lycopersicum), and their close relatives. Other members of the Potato clade include Solanum sections Anarrhichomenum, Basarthrum, and Herpystichum. Within the Potato Clade, sect. Pteroidea is most closely related to sect. Herpystichum. The precise relationships of groups within the Potato clade remain unclear, with some analyses indicating that sections Herpystichum and Pteroidea are sister to each other, and others suggesting that sect. Herpystichum is a grade leading to sect. Pteroidea. Section Pteroidea is characterized by having inflorescences in an axillary position and by rugose, sharply pointed, conical fruits in most species. Our analyses suggest a single origin of the unusual conical fruits with a single reversal to globose fruits in S. mite. Neither simple nor compound-leaved species form a clade, indicating frequent shifts in leaf complexity during diversification of the section. Preliminary results suggest that the two widespread species in the section, S. anceps and S. mite, may not be monophyletic. Continuing work is aimed at addressing these two species and the relationship between sections Pteroidea and Herpystichum.
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Bohs Lab webpage
1 - University of Utah, Department of Biology, 257 South 1400 East, Salt Lake City, Utah, 84112, USA
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Magpie A/Cliff Lodge - Level B
Date: Tuesday, July 28th, 2009
Time: 3:00 PM