Systematics Section / ASPT
Bohs, Lynn , Martine, Christopher T. , Stern, Stephen , Myers, Nicole .
Phylogeny of the Old World clade of the spiny solanums (Solanum subg. Leptostemonum).
Solanum subgenus Leptostemonum includes the “spiny solanums” and, with approximately 350 to 450 species, is the largest subgenus of Solanum. Previous molecular phylogenetic studies have identified a large monophyletic group, the Old World clade, which includes nearly all spiny Solanum species native to the Old World. Results are presented from molecular phylogenetic analyses using ITS and waxy sequence data sampled from over 100 species from the Old World clade, including over 65 Australian species, 25 African taxa, and 10 representatives from Asia, Madagascar, Hawaii, and New Caledonia. The Old World clade emerges as a well-supported monophyletic group. The strict consensus tree from the combined data is well-resolved, but bootstrap support is generally poor, especially along the backbone; however, a number of small clades receive robust support. One well-supported group includes a subset of Australian endemics plus species from Hawaii and New Caledonia. ITS and combined data suggest a second clade consisting of species from Australia, Madagascar, Africa and Macaronesia, and Asia, but this group receives low bootstrap support. The endemic Malagasy species form a monophyletic group. The dioecious Australian species form two separate clades, consistent with previous results. Resolution is not sufficient to determine conclusively whether the African taxa form a single clade, or if dioecy evolved from andromonoecy in the endemic Australian Solanum species.
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Solanaceae Source website
1 - University of Utah, Department of Biology, 257 S. 1400 E., Salt Lake City, Utah, 84112, USA
2 - Plattsburgh State University of New York, Biological Sciences, 101 Broad Street, Plattsburgh, NY, 12901, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Lake Erie/Hilton
Date: Monday, July 9th, 2007
Time: 11:15 AM