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Abstract Detail

Systematics Section

Clark, John L.  [1], Smith, James F. [2].

A Multi-Gene Sequencing Approach to Resolve Relationships within Tribe Episcieae (Gesneriaceae).

Recent investigations into the phylogenetic relationships within tribe Episcieae of Gesneriaceae have resulted in new generic boundaries and a better understanding of the evolution of morphological characters in this diverse group. The present study makes use of increased sampling both at the taxon and data level in an attempt to more fully resolve and support the relationships within this tribe. A clade consisting of Paradrymonia, Nautilocalyx, and Chrysothemis was recovered as sister to the remainder of the tribe although only the latter genus was recovered as monophyletic and imbedded within a polyphyletic assemblage of Paradrymonia and Nautilocalyx. Some species of Paradrymonia are strongly supported as belonging elsewhere in the tribe, but for the most part any conclusions regarding the generic boundaries of these three taxa will need to await further investigation. The next clade to diverge includes a group of species endemic to the Guyanas. Lampadaria has not yet sampled, but is predicted to go here based on its fruit characters. A monophyletic clade of Columnea, Glossoloma, Drymonia, Neomortonia, Alloplectus, Corytoplectus and Crantzia was also recovered. However, support for relationships within this clade are low or unresolved with the exception of resolving Crantzia as sister to the remainder of the clade. Sampling to nearly 10,000 bp of chloroplast, ribosomal RNA, and low copy nuclear genes provides strong support for relationships among these genera. Columnea is monophyletic and sister to Glossoloma. Neomortonia is not monophyletic with N. rosea sister to Drymonia, and N. nummularia sister to a clade inclusive of Alloplectus, Drymonia, N. rosea, Glossoloma and Columnea. Corytoplectus is sister to all members of this clade except Crantzia. This resolution allows the discovery of morphological synapomorphies to unite these groups and form the basis for further hypothesis testing of relationships and monophyly of genera with greater taxon sampling.

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1 - The University of Alabama, Department of Biological Sciences, Box 870345, Tuscaloosa, Alabama, 35487-0345, USA
2 - Boise State University, Department of Biological Sciences, 1910 University Drive, Boise, Idaho, 83725-1515


Presentation Type: Oral Paper:Papers for BSA Sections
Session: 32
Location: Rendezvous A/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 11:00 AM
Number: 32012
Abstract ID:76