Systematics Section / ASPT
Carlson, Sara , Hahn, William James .
Molecular systematics of Caryoteae (Arecaceae) based on chloroplast intergenic spacers trnD-trnT and trnQ-rps16.
CARYOTEAE (Arecaceae) is composed of three genera – Caryota, Arenga and Wallichia – and ~43 species that occur in Southeast Asia with extensions in India, China and the South Pacific. Phylogenetic relationships within Caryoteae were examined with special attention to the recently discovered species, Caryota ophiopellis, a morphological intermediate between Caryota and Arenga. Chloroplast intergenic spacers trnD-trnT and trnQ-rps16 were sequenced for 34 species, including representatives from all three genera and outgroup species in the Coryphoideae. Analysis with trnD-trnT showed poor resolution and trnQ-rps16 resolved relationships at the generic but not species level. Results for trnQ-rps16 confirmed the monophyly of Caryoteae and of the three genera. C. ophiopellis was not assigned to any genera, but instead resolved as sister to Caryota, with Arenga+Wallichia forming a clade sister to Caryota+C. ophiopellis. Caryota is traditionally distinguished by the presence of bipinnate leaves, but the placement of C. ophiopellis challenges this character as the synapomorphy for Caryota and suggests that others such as ruminate endosperm or bisexual inflorescences are more appropriate. Analyses with additional markers, such as nuclear introns, are needed to resolve species-level relationship within the group.
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1 - Yale University, Department Ecology & Evolutionary Biology, Po Box 208105, New Haven, Connecticut, 06520-8105, USA
2 - Georgetown University, Georgetown College, 108 White-Gravenor, Po Box 571003, Washington, DC, 20057-1003, USA
Presentation Type: Poster:Posters for Sections
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM