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Abstract Detail

Systematics Section/ASPT

Clavijo, Laura [1], Clark, John L. [2], Kriebel, Ricardo [3], Zuluaga, Alejandro [4].

Character evolution in the Neotropical genus Drymonia (Gesneriaceae).

Morphological convergence is prevalent across the family Gesneriaceae and poses a challenge for biologists to recognize and define generic boundaries. The genus Drymonia with 75+ species is one of the most morphologically variable and largest genera within the Neotropical Gesneriaceae. The genus ranges from southern Mexico to Bolivia, including northern Brazil, Guyana, and the Caribbean, with the highest species richness in northern South America. Characters such as leafy calyx and large corolla that were used to circumscribe the genus are homoplasic across the tribe Columneinae (Episcieae). The presence of poricidal anther dehiscence, historically used to identify the species of Drymonia, has been lost in several lineages within the genus.  Here we reconstruct the ancestral states for floral, fruit, and habit characters. A molecular phylogeny including 75 species of Drymonia was inferred from the internal transcribed spacer (ITS) and external transcribed spacer (ETS) of the 18S-26S regions of the nuclear ribosomal DNA (nrDNA), and from two intergenic regions of the chloroplast genome (trnH-psbA and trnK-matK). The phylogeny supports the monophyly of the genus and its close relationship to a clade formed by Columnea, Glossoloma, Alloplectus and Neomortonia. Additionally, the ancestral state reconstructions strongly support the convergence of hypocyrtoid corollas (3 independent origins) and indehiscent berries (3 independent origins).

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1 - University Of Alabama, Biological Sciences, P.O. Box 870345, 425 Mary Harmon Bryant Hall, Tuscaloosa, AL, 35487-0345, USA
2 - The University Of Alabama, Department Of Biological Sciences, Box 870345, Tuscaloosa, AL, 35487, USA
3 - University of Wisconsin-Madison, Department of Botany, 430 Lincoln Drive, Madison, WI, 53706, USA
4 - University of Wisconsin-Madison, Botany, 430 Lincoln Dr, Madison, WI, 53706, USA

character reconstruction.

Presentation Type: Oral Paper:Papers for Sections
Session: 45
Location: River Fork/Grove
Date: Wednesday, July 30th, 2014
Time: 2:00 PM
Number: 45003
Abstract ID:859
Candidate for Awards:None


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