Coleman, Cassandra , Clark, John L. .
A revised phylogeny and study of pollinator shifts and floral traits in the neotropical genus Gasteranthus (Gesneriaceae).
The genus Gasteranthus, with 40 currently described species, occurs in Central and South America. Species of Gasteranthus have two morphologically different corolla shapes, which are suggestive of specific pollinators. The flower shapes are either hypocyrtoid with an inflated ventral pouch or funnel form and non-pouched. Previous molecular phylogenies of Gasteranthus were equivocal of whether or not hypocyrtoid flowers were an apomorphy or plesiomorphy. Molecular sequence data generated from nrDNA (ITS and ETS) and cpDNA (matKR and trnLF) were generated for 80 taxa representing 25 taxa of Gasteranthus and 55 taxa from closely related genera. Our data strongly supports that funnelform flowers associated with euglossine bee pollination are symplesiomorphic and that bee pollination has evolved at least three times in Gasteranthus. Pollen presentation and nectar reading schedules, as well as pollinator identification and videography were utilized to better understand the role of pollinators on the species of Gasteranthus.
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1 - The University of Alabama, Department of Biological Sciences, Box 870345, Tuscaloosa, AL, 35487, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Waterman Room/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 3:45 PM