Hartooni, Nairi , Guilliams, C. Matt , Baldwin, Bruce G. .
Phylogenetic Relationships in the Genus Lewisia (Montiaceae), Inferred Using nrDNA (ITS, ETS) and cpDNA (rps16).
The genus Lewisia comprises between 25 and 30 taxa of perennial flowering plants in the Montia family, or Montiaceae. This variable, western North American genus has been the subject of three recent monographic treatments, each of which has proposed slightly different infrageneric classifications. Molecular phylogenetic data have been lacking to resolve evolutionary relationships and evaluate these classifications, however. Here we examine evolutionary relationships in the genus Lewisia using DNA sequence data from the internal and external transcribed spacer regions of the nuclear genome as well as rps16 intron of the chloroplast genome. Sequence data have been obtained for nearly all recently recognized Lewisia taxa and for many outgroups in the Montiaceae, including Calandrinia, Calyptridium, Cistanthe, Claytonia, Lenzia, Lewisiopsis, Montia, Montiopsis, and Phemeranthus. Hypotheses of relationships in Lewisia resulting from phylogenetic analyses are congruent with some elements of each of the previous classifications. Lewisia is recovered as a monophyletic group with strong support in all analyses, and several clades within the genus are resolved. Increased taxon sampling within Lewisia and including additional DNA regions in analyses are likely to improve phylogenetic understanding and allow for a more definitive evaluation of previous classifications.
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1 - University of California, Berkeley, Department of Environmental Science, Policy, & Management, 137 Mulford Hall, Berkeley, CA, 94720, USA
2 - University of California, Berkeley, Integrative Biology, 1001 Valley Life Sciences Building, Berkeley, CA, 94720, USA
3 - University of California, Berkeley, Department of Integrative Biology, University and Jepson Herbaria, 1001 Valley Life Sciences Bldg. #2465, Berkeley, California, 94720, USA
Presentation Type: Poster:Posters for Sections
Location: Hall A/Convention Center
Date: Monday, August 2nd, 2010
Time: 5:30 PM