Holman, Garth , Del Tredici, Peter , Havill, Nathan , Lee, Nam Sook , Campbell, Christopher .
Phylogenetic studies in Tsuga (Pinaceae).
The phylogeny of Tsuga is well studied, with the western North America sister taxa T. heterophylla and T. mertensiana occupying a basal position to the remainder of the genus, followed by the eastern North American T. canadensis. The southern Appalachian endemic T. caroliniana is more closely related to the Asian hemlocks than it is to the partially sympatric T. canadensis. Although T. caroliniana consistently appears in well-supported clades with the Asian hemlocks, previous studies have not resolved the relationship between T. caroliniana and the Asian hemlocks. Recent molecular phylogenies have revealed a distinct lineage from Ulleung island, South Korea, whose relationships to other Tsuga taxa vary between chloroplast and nuclear markers. Our preliminary 4CL phylogeny resolves the Ulleung hemlock as sister to a clade containing T. caroliniana and the remaining Asian hemlocks, in contrast to published cpDNA and ITS phylogenies closer relationship between T. diversifolia and the Ulleung hemlock. These results suggest that the Ulleung hemlock lineage arose before T. caroliniana diverged from the rest of the Asian hemlocks.
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1 - University Of Maine, School Of Biology And Ecology, 5735 Hitchner Hall, Orono, ME, 04469, USA
2 - ARNOLD ARBORETUM, 125 ARBORWAY, JAMAICA PLAIN, MA, 02130-3519, USA
4 - Ewha Womans University, Department of Life Sciences, Seoul, 120-750, KOREA
5 - University Of Maine, Department Of Biological Sciences, 261 HITCHNER HALL, ORONO, ME, 04469-5735, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Delaware B/Hyatt
Date: Wednesday, July 11th, 2012
Time: 2:45 PM