Colloquia: Emerging Results from Studies of Gymnosperms on the Tree of Life II
Kelch, Dean , Raubeson, Linda A. , Mathews, Sarah , Rai, Hardeep , Moore, Abigail .
Multigene approaches to resolving deep branches in Podocarpaceae Phylogeny.
The Podocarpaceae is an ancient conifer group. Based on fossil evidence, some modern genera date back at least to the Early Cretaceous and certain sub-lineages date back to the Mid Jurassic. Combined analyses of ten gene sequences included markers of differing variability from all three cellular compartments. These resulted in several well-supported clades. The Podocarpus clade includes the type as well as Nageia, Afrocarpus, and Retrophyllum. The Tropical Clade includes Dacrydium, Dacrycarpus, and Falcatifolium. The Scale-Leaved Clade contains Lagarostrobos, Manoao, Halocarpus, and other taxa of Holantarctic distribution. Deep branches within the family are not confidently resolved, as is common in old lineages having undergone extensive extinction. Nevertheless, a topology is recovered favoring Phyllocladus as sister to the rest of the family, followed by a branch leading to Lepidothamnus. An alternative topology, particularly favored by signal from the nuclear gene XDH, shows the family consisting of two main clades. In these topologies one clade contains Phyllocladus, Prumnopitys and scale-leaved taxa, while the other has Saxegothaea as sister to the Podocarpus Clade plus Tropical Clade. In all analyses Phyllocladus resolves as part of a highly supported podocarp clade. Therefore, Phyllocladus is best retained within the family Podocarpaceae.
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1 - California Department of Food & Agriculture, 3294 Meadowview Road, Sacramento, California, 95832, USA
2 - Central Washington State University, Department of Biological Sciences, Ellensburg, Washington, 98926-7537, USA
3 - Harvard University, Arnold Arboretum, Harvard University Herbaria, 22 Divinity Avenue, Cambridge, MA, 02138, USA
4 - University of California Berkeley, Department of Integrative Biology, University and Jepson Herbaria, 3060 Valley Life Sciences Building, Berkeley, California, 94720, USA
Presentation Type: Symposium or Colloquium Presentation
Location: Ballroom C/Convention Center
Date: Monday, August 2nd, 2010
Time: 1:45 PM