Coleman, Cassandra L. , Clark, John L. .
A phylogeny of the Neotropical plant genus Gasteranthus (Gesneriaceae): implications for understanding shifts in pollinators and floral diversification.
The genus Gasteranthus,with 45 currently described species, occurs in Central and South America. Species of Gasteranthus have two morphologically different corolla shapes that are correlated with specific pollinators: hypocyrtoid corollas are defined by an inflated ventral pouch and campanulate corollas are defined by a funnelform shape. Previous molecular phylogeniesof Gasteranthus were equivocal as to 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 61 taxa representing 28 species of Gasteranthus and 33 species from closely related genera. Our data strongly supports that funnelform flowers have evolved at least three times in Gasteranthus and that hypocyrotid flowers are symplesiomorphic. Our results also support that Gasteranthus dressleri from Panama is more closely related to Cremosperma than other Gasteranthus. Pollen presentation and nectar reading schedules, as well as pollinator identification and videography were utilized to document euglossine bee pollination in funnelform taxa and hummingbird pollination in hypocyrtoid taxa.
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1 - University of Alabama, Biological Sciences, 425 Mary Harmon Bryant Hall, Tuscaloosa, AL, 35487, United States
2 - University of Alabama, Biological Sciences, Box 870345, Tuscaloosa, AL, 35487, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Delaware C/Hyatt
Date: Wednesday, July 11th, 2012
Time: 8:15 AM