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Abstract Detail

Colloquia: Emerging Results from Studies of Gymnosperms on the Tree of Life II

Holman, Garth [1], Cronn, RC [2], Gernandt, David S. [3], Graham, Sean W. [4], Kelch, Dean [5], Liston, Aaron [6], Mathews, Sarah [7], Parks, Matthew [8], Rai, Hardeep [7], Raubeson, Linda A. [9], Rothwell, Gar W. [10], Stevenson, Dennis Wm. [11], Stockey, Ruth A. [12], Campbell, Christopher S. [1].

Rooting Pinaceae.

Pinaceae have no known living close relatives. Therefore, rooting of the Pinaceae phylogenetic tree and understanding relationships within the family are difficult. While subfamilies Abietoideae (Abies, Keteleeria, Nothotsuga, Pseudolarix, and Tsuga) and Pinoideae (Cathaya, Larix, Picea, Pinus, and Pseudotsuga) are generally well supported by molecular and morphological data, the position of Cedrus remains unclear, occurring either as sister to the rest of the family or to Abietoideae, depending upon data and analytical approaches. Previous analyses of one or a few plastid regions have not definitively identified the Pinaceae root. Similarly, our analysis of a majority of the plastid exons from multiple species of each genus weakly supports Cedrus as sister to Abietoideae when Cycas is the outgroup. Other outgroups are being explored, and the presence of two copies of the nuclear locus phytochrome P allows a duplicate gene rooting approach, which results in strong support for Cedrus as sister to Abietoideae. Numerous character states from wood anatomy and ovulate cone morphology are potentially informative within Pinaceae. For example, horizontal resin canals in the secondary xylem occur in all Pinoideae and not in Abietoideae and Cedrus, and resin canals in the integument occur in all Abietoideae and Cedrus but not in Pinoideae. Additionally there is a single resin canal located in the center of the primary xylem of the taproot of Abietoideae and Cedrus whereas all Pinoideae have resin canals located adjacent to each protoxylem pole. Determining outgroup character states for these resin canal characters is difficult because resin canals in the xylem are not found outside Pinaceae in extant conifers, and resin canals in the integument are rare outside Pinaceae. Several characters of the ovuliferous scale and seed unite members of Abietoideae plus Cedrus, but homologues of the scale and seed wing outside the family are uncertain.

Broader Impacts:

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Related Links:
Gymnosperm AToL, Resolving the Phylogeny of the Seed Plants

1 - University of Maine, School of Biology and Ecology, Orono, ME, 04469-5735, USA
2 - US Forest Service, Pacific NW Research Station, Genetics, 3200 SW Jefferson Way, Corvallis, Oregon, 97331, USA
3 - Instituto de Biología, Universidad Nacional Autonoma de Mexico, Departamento de Botánica, A. p. 70-367, Mexico, D.F., 04510, Mexico
4 - University of British Columbia, Botanical Garden And Centre For Plant Research, 6804 Sw Marine Drive, Vancouver, British Columbia, V6T 1Z4, Canada
5 - California Department of Food & Agriculture, 3294 Meadowview Road, Sacramento, California, 95832, USA
6 - Oregon State University, Department of Botany & Plant Pathology, 2082 Cordley Hall, Corvallis, Oregon, 97331-2902, USA
7 - Harvard University, Arnold Arboretum, Harvard University Herbaria, 22 Divinity Avenue, Cambridge, MA, 02138, USA
8 - Oregon State University, Department of Botany and Plant Pathology, 2082 Cordley Hall, Corvallis, OR, 97331, USA
9 - Central Washington University, Department of Biological Sciences, 400 E University Way, Ellensburg, WA, 98926-7537, USA
10 - Ohio University, Department of Environmental & Plant Biology, Porter Hall, Richland Avenue, Athens, Ohio, 45701-2979, USA
11 - New York Botanical Garden, Bronx, NY, 10458, USA
12 - University of Alberta, Department of Biological Sciences, Biological Sciences Centre, Cw 405, Edmonton, Alberta, T6G 2E9, Canada

phylogenetic tree
resin canals
Ovulate cone.

Presentation Type: Symposium or Colloquium Presentation
Session: C2
Location: Ballroom C/Convention Center
Date: Monday, August 2nd, 2010
Time: 2:30 PM
Number: C2007
Abstract ID:539

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