Systematics Section / ASPT
Riggins, Chance , Seigler, David S. , Miller, Joseph T. , Ebinger, John E. .
Phylogeny of American species of Vachellia (former Acacia subg. Acacia) based on nrDNA ITS sequence data.
A molecular analysis utilizing nuclear ITS sequences was conducted to investigate the phylogenetic relationships of the genus Vachellia and related species of Acacia sensu lato. Ingroup taxa were selected to include representatives from Vachellia (formerly Acacia subg. Acacia), Senegalia (Acacia subg. Aculeiferum sect. Monacanthea), the proposed genus Mariosousa (“Acacia coulteri group”), Acacia subg. Phyllodineae, Acaciella (Acacia sect. Filicinae), and the tribe Ingeae. Three species from the genus Mimosa served as the outgroup. Parsimony analysis suggested that Mariosousa forms a clade that is basal to a larger clade consisting of Vachellia, Senegalia, Acaciella, Acacia subg. Phyllodineae, and Ingeae. Within this large clade, members of Vachellia form a monophyletic group that is sister to a second clade, which in turn, is composed of two subclades. One subclade is composed of species in the tribe Ingeae, Acacia subg. Phyllodineae, and the genus Leucaena. The second subclade contains members of the genera Senegalia and Acaciella, but additional sampling is needed to resolve their position with certainty. Within the Vachellia clade, species are grouped in clades corresponding to the subgroups proposed by Seigler, Ebinger and coworkers, based on morphological analyses. These clades consist of species related to V. macracantha, to V. cornigera, to V. farnesiana, to V. constricta, and to V. pringlei.
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1 - University of Illinois Urbana, Department of Plant Biology, 239 Morrill Hall, 505 South Goodwin Avenue, Urbana, Illinois, 61801-3707, USA
2 - University of Illinois Urbana, Department of Plant Biology, 265 Morrill Hall, 505 South Goodwin Avenue, Urbana, Illinois, 61801-3707, USA
3 - University of Iowa, Biology Department, 138 Biology Building, Iowa City, Iowa, 52242, USA
4 - Eastern Illinois University, 45 Heather Drive, Charleston, Illinois, 61920, USA
Presentation Type: Poster:Posters for Sections
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM