Systematics/Phytogeography / Taxonomie/ Section
Bush, Catherine , Kron, Kathleen A. .
Phylogeny of Gaultherieae (Ericaceae) based on DNA sequence data from matK, ndhF and ITS.
Phylogenetic relationships within the Gaultherieae (Chamaedaphne, Leucothoe, Diplycosia, Tepuia and Gaultheria) were examined with molecular (matK, ndhF and ITS) data. Parsimony and Bayesian analyses were performed in PAUP and MrBayes, respectively, for each gene, combined chloroplast data and total combined data. These analyses confirm the monophyly of the Gaultherieae. The wintergreen group (Diplycosia, Tepuia and Gaultheria) is strongly supported as monophyletic. Resolution is weak within this group among major clades, but many smaller and geographically differentiated clades are strongly supported. Diplycosia is monophyletic and sister to members of Gaultheria. Tepuia groups within the wintergreen clade but its relationship to other clades is unresolved. The biogeographic origin of the Gaultherieae and the evolution of several morphological characters were assessed using the single tree from the combined data Bayesian analysis. The biogeographic analysis indicated a north-temperate origin for both the tribe and the wintergreen clade. The morphological analyses revealed that 1.) a dry fruit without a fleshy calyx is plesiomorphic for the Gaultherieae, 2.) a fleshy accrescent calyx is plesiomorphic for the wintergreen clade, 3.) awned anthers are plesiomorphic for the wintergreen clade, 4.) anther tubules have been independently gained several times and a complete loss of anther appendages have also occurred several times within the Gaultherieae and 5.) contrary to the expectation based on prior classifications, solitary-flowered inflorescences have evolved independently in several lineages.
Log in to add this item to your schedule
1 - Wake Forest University, Department of Biology, PO Box 7325, Winston-Salem, NC, 27109-7325, USA
2 - Wake Forest University, Department of Biology, PO Box 7325, Winston-Salem, North Carolina, 27109-7325, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Room 3/Woodward
Date: Monday, July 28th, 2008
Time: 4:30 PM