Porter-Utley, Kristen , Krosnick, Shawn , Mcdade, Lucinda , Jolles, Diana , Jørgensen, Peter M. , MacDougal, John M. .
Untangling the passionflower vines: insights on the phylogeny of Passiflora subg. Decaloba based upon cytGS, ITS,ncpGS, ndhF, and trnL-F sequences.
Passiflora is a large genus of ca. 550 species of vines, lianas, and trees known for its incredible morphological diversity and stunningly beautiful flowers. The genus is currently recognized with five subgenera: Astrophea, Decaloba, Deidamioides, Passiflora, and Tetrapathea.The largest and most diverse subgenera are Passiflora and Decaloba, each consisting of ca. 235 species. Due to its economic significance, subg. Passiflora has been the focus of most recent scientific study. The equally fascinating and species-rich subg. Decaloba has been largely ignored, yet this group displays equivalent morphological and ecological variation. Moreover, it consists of many species that are currently recognized as threatened or endangered and has special biogeographic significance in that it is the only clade in the genus with species naturally present in both the New and Old World. Subgenus Decaloba contains eight supersections, of which only two, Disemma and Cieca, have been tested for monophyly.Thus, we present here a preliminary phylogenetic analysis of subg. Decalobabased on cytGS, ncpGS, ndhF, ITS, and trnL-F data and including taxa that represent all supersections in subgenus Decaloba. These data support the monophyly of supersections Auriculata, Bryonioides, Cieca, Decaloba, Disemma, Hahniopathanthus, and Pterosperma, but suggest that Multiflora is polyphyletic as currently defined. Morphological and molecular synapomorphies for the monophyletic lineages are provided. We also use the molecular dataset to explore rates of diversification across the subgenus. Recent analyses with limited sample sizes have suggested that rates of nucleotide substitution have been relatively constant across Decaloba. Given the morphological variability observed in this clade, these conclusions are revisited and possible explanations for this diversity are considered. This is the third presentation stemming from NSF 0717084 to PIs P.M. Jorgensen, S. Krosnick, J.M.MacDougal, L. McDade, and K. Porter-Utley.
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1 - Keene State College, Biology, 229 Main St., MS-2001, Keene, NH, 03435, United States
2 - Southern Arkansas University, Biology, 100 E. University, P.O. Box 9222, Magnolia, AR, 71753, USA
3 - Rancho Santa Ana Botanic Garden, Department Of Botany, 1500 N. College Avenue, Claremont, CA, 91711, USA
4 - Rancho Santa Ana Botanic Garden, Claremont Graduate University, 1500 North College Avenue, Claremont, CA, 91711, USA
5 - Missouri Botanical Garden, P.O. Box 299, St. Louis, MO, 63166, USA
6 - Harris-Stowe State University, Math and Sciences, 3026 Laclede Avenue, St. Louis, MO, 63103, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell C/Chase Park Plaza
Date: Tuesday, July 12th, 2011
Time: 9:45 AM