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Abstract Detail

Systematics/Phytogeography / Taxonomie/ Section

Haberle, Rosemarie [1], Dang, Ashley [2], Lee, Tammy [2], Peñaflor, Cynthia [2], Cortes-Burns, Helen [2], Oestreich, Andrea [3], Raubeson, Linda A. [4], Cellinese, Nico [5], Kim, Sang-Tae [6], Edwards, Erika [7], Eddie, William M.M. [8], Jansen, Robert K. [9].

Taxonomic and biogeographic implications of a three gene phylogeny of the Campanulaceae sensu stricto.

The large, nearly cosmopolitan angiosperm family Campanulaceae is well-accepted as monophyletic but intrafamilial and intrageneric relationships are controversial. We used DNA sequences of atpB, matK, and rbcL to infer the phylogeny of 102 taxa in 41 genera plus four outgroup taxa. This is the most comprehensive, family-wide molecular systematic study to date, with the broadest representation of the family’s taxonomic and geographic diversity. Results from maximum parsimony and Bayesian analyses provide strong evidence for two major clades, with platycodonoids sister to the remaining members of the family, wahlenbergioids and campanuloids. There are two clear divisions within the campanuloids that correspond well with the historical Campanula s. str. and Rapunculus groups of Boissier and Fedorov. The phylogenetic positions of European Wahlenbergia hederacea and the genus Jasione remain unresolved. Our results also provide evidence that the large, inclusive genera Wahlenbergia and Campanula are polyphyletic, and the smaller genera Symphyandra, Prismatocarpus, and Legousia are not monophyletic. Insights are provided into different biogeographic origins of island endemics. Heterochaenia, Nesocodon, and Berenice of the Indian Ocean Mascarene Islands occur in a single clade; conversely, Wahlenbergia linifolia and Wahlenbergia angustifolia of St. Helena Island in the mid-Atlantic are not sister taxa. The Macaronesian taxa, Canarina canariensis and Musschia aurea, which display convergent bird-pollination adaptations and with Azorina vidalii of the Azores, woody growth form, fall into separate major lineages. Cretan endemics sampled are all within the campanuloid clade, but do not form a monophyletic group, so likely did not evolve following a single vicariance or dispersal event. North American Campanulaceae also do not form a monophyletic group, suggesting that these taxa are descendents of multiple introductions to North American. This work presents a well supported phylogenetic framework for future taxonomic studies and reclassification, and provides clues to the biogeographic history of this family.

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1 - University of California, Davis, Department of Plant Sciences, Mail Stop 2, One Shields Avenue, Davis, CA, 95616, USA
2 - University of Texas, Section of Integrative Biology and Institute of Cellular and Molecular Biology, Austin, TX, 78712, USA
3 - Central Washington University, Department of Biological Sciences, Ellensburg, WA, 98926, USA
4 - Central Washington State University, Department of Biological Sciences, Ellensburg, Washington, 98926-7537, USA
5 - University of Florida, Florida Museum of Natural History, Dickinson Hall, PO Box 117800, Gainseville, FL, 32611, USA
6 - Max Planck Institute for Developmental Biology, Department of Molecular Biology, (VI), Spemannstr. 37-39, Tubingen, D-72076, Germany
7 - Brown University, Department of Ecology and Evolutionary Biology, Box G, Providence, RI, 02912, USA
8 - University of Edinburgh, Office of Lifelong Learning, 11 Buccleuch Place, Edinburgh, Scotland, EH8 9LW, United Kingdom
9 - University of Texas Austin, Section of Integrative Biology, 1 University Station, A6700, Austin, Texas, 78712-7640, USA

chloroplast DNA
molecular phylogenetics.

Presentation Type: Oral Paper:Papers for Sections
Session: 62
Location: 201/Law
Date: Wednesday, July 30th, 2008
Time: 3:00 PM
Number: 62009
Abstract ID:712

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