Systematics/Phytogeography / Taxonomie/ Section
Wilcox, Kevin R. , Fine, Nichole L. Y. , Peery, Rhiannon , Raubeson, Linda A. .
Phylogeny of Podocarpaceae: Evidence from Three Genomes.
Many generic relationships in the Southern Hemisphere conifer family Podocarpaceae remain unresolved. In order to further develop phylogenetic hypotheses, we are sequencing atpB and atpE from the chloroplast, the nad5 intron from the mitochondria and the XDH (xanthine dehydrogenase) gene from the nucleus from 26 representatives of Podocarpaceae and two Araucariaceae outgroups. The nad5 region has been used in phylogenetic studies in the Pinaceae and the atpB-atpE region has been fairly widely applied as a phylogenetic marker but neither has been used to resolve issues within the Podocarpaceae. The XDH gene is virtually untested. We currently have complete sequence data for all gene regions under consideration for 16 of the 28 taxa and partial sequence for all markers for 22 taxa. Preliminary results for the 22 taxa include some relationships that agree with the results of previous studies such as the monophyletic derived clade that includes Podocarpus, Dacrydium and their segregates. With our current representation some controversial relationships remain ambiguous although the maximum parsimony tree based on all three markers Sundacarpus is strongly nested within the Prumnopitys clade, and Saxegothaea is found, with weak bootstrap support, to be a sister group to the Microcachrys+Microstrobos clade. It remains to be seen how these results will change once we have complete data for all taxa and markers.
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1 - Central Washington University, Biological Sciences, 400 E. University Way, Ellensburg, WA, 98926-7537, U.S.A.
2 - Central Washington University, Biological Sciences, 400 E University Way, Ellensburg, WA, 98926-7537, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Room 6/Woodward
Date: Tuesday, July 29th, 2008
Time: 9:00 AM