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Abstract Detail

Recent Topics Posters

Owart, Birkin [1], Fine, Nichole L. Y. [2], Wilcox, Kevin R. [2], Peery, Rhiannon [3], Raubeson, Linda A. [3].

Investigating generic relationships in the Podocarpaceae based on evidence from three genomes.

Sequence data from nad5 (mitochondrial), atpB and atpE (chloroplast), and XDH (nuclear) was generated for 31 taxa with the intent of resolving generic relationships in the southern-hemisphere conifer family Podocarpaceae. Previous work has suggested three groupings of genera: a “derived” clade composed of Podocarpus and its segregates, Dacrydium and its segregates, and Acmopyle; a “basal” group of taxa that has usually not been a monophyletic group but instead resolved as small clades diverging sequentially; and, an “intermediate” group composed of Saxegothea, Microstrobos, and Microcachrys, which are placed basal to the derived clade in every possible combination of relationship to one another and the derived clade. In our work, the three markers were analyzed, together and individually, using maximum parsimony and maximum likelihood. The relationships among the “derived” clade were well supported and congruent across the different data matrices and analytical methods. All analyses also supported a “basal” clade rather than a comb with high (>97) bootstrap support (except for XDH where the clade recieves weak support). Although analyses agree with Microstrobus, Microcahrys, and Saxegothea being placed “intermediate” to a “basal” clade and a “derived” clade, all analyses are inconsistent in their exact placement similar to earlier studies. Perhaps our most interesting finding related to Phyllocladus, which has been segregated as its own family due to its distinctive morphology. Our results embed Phyllocladus firmly within the “basal” clade, indicating that the genus should remain within the Podocarpaceae.

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1 - Central Washington University, Department of Biological Sciences, 400 E. University Way, Ellensburg, WA, 98926-7537, USA
2 - Central Washington University, Biological Sciences, 400 E. University Way, Ellensburg, WA, 98926-7537, U.S.A.
3 - Central Washington University, Biological Sciences, 400 E University Way, Ellensburg, WA, 98926-7537, USA

low-copy nuclear gene.

Presentation Type: Recent Topics Poster
Session: P
Location: Hall A/Convention Center
Date: Monday, August 2nd, 2010
Time: 5:30 PM
Number: PRT016
Abstract ID:1119

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