Systematics Section / ASPT
Tyrrell, Christopher D. , Santos-Gonçalves, Ana Paula , Triplett, J.K. , Clark, Lynn G. .
Polyphyly of the New World fan-branching bamboos (Poaceae: Bambusoideae).
Arthrostylidiinae is a monophyletic Neotropical woody bamboo subtribe comprising 13 genera and about 165 described species, but whose morphological traits often overlap making the taxonomy of the group difficult. Three of the 13 genera have a characteristic fan-shaped, or apsidate, branching pattern: Actinocladum Soderstrom, Merostachys Sprengel, and Rhipidocladum McClure. We test whether apsidate branching is monophyletic within the Arthrostylidiinae. We generated DNA sequences from 4 noncoding chloroplast intergenic spacers: trnD-trnT, trnT-trnL, trnC-rpoB, and rps16-trnQ. We chose 32 taxa: 6 species of Rhipidocladum, the only species of Actinocladum, 2 species of Merostachys, 18 species from 7 additional genera within the Arthrostylidiinae, 4 from the recognized sister group to the Arthrostylidiinae, and an outgroup. We aligned the sequences manually and coded the indels as a presence/absence matrix. We analyzed the data using unweighted maximum parsimony to generate a preliminary phylogeny. We confirm the monophyly of the Arthrostylidiinae and recover 5 subclades in a polytomy. Apsidate branching is homoplasious with two origins and therefore the fan-branching bamboos are polyphyletic. We suggest morphological synapomorphies for the 5 recovered clades of the Arthrostylidiinae and contrast the differences from the current classification. For the future of this ongoing project, we will add more taxa and other regions to fully resolve and further test the phylogeny and examine character evolution.
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Bamboo Biodiversity Website
1 - Iowa State University, Department of Ecology, Evolution, and Organismal Biology, 253 Bessey Hall, Ames, Iowa, 50011-1020, USA
2 - Universidade Estadual de Campinas, Departamento de Botânica—IB, Caixa Postal 6109, 13083-970 Campinas, São Paulo, São Paulo, Brasil
3 - Iowa State University, Department of Ecology, Evolution & Organismal Biology, 253 Bessey Hall, Ames, Iowa, 50011-1020, USA
Presentation Type: Poster:Posters for Sections
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM