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Abstract Detail


Systematics Section / ASPT

Roberts, Roland [1], Daze, Pierre E. [2].

Unraveling evolutionary relationships within subtribe Solidagininae: Multiple genes, phylogenetic signal and incongruence.

Hypotheses of evolutionary relationships among species within subtribe Soladigininae, to date, have been based on analyses of morphology, anatomy, chloroplast restriction site data, and sequences of nuclear ribosomal genes. These analyses have assisted in defining major lineages within the subtribe but offered little resolution of relationships among species within genera. We explored the utility of two nuclear (CHI and (TPI) and three chloroplast genes (ndhF, trnL, rpS16) for evaluating evolutionary relationships among species of the subtribe. Specifically, we explored the relationship among species of Chrysothamnus, and of Chrysothamnus to other genera of Solidagininae. Phylogenetic analysis revealed inconsistent signal and varying degrees of resolution across datasets. Phylograms resulting from independent analysis of each data set were evaluated for common lineages with strong statistical support. In addition, a total evidence approach was taken using data partitions in Bayesian phylogenetic inference. This approach facilitated the application of specific models of evolution to each data partition. The results of this study offers promise for resolving infrageneric relationships in subtribe Solidagininae and may serve as a model for addressing similar problems in other Astereae.


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1 - Towson University, Department of Biological Sciences, 341 Smith Hall, Towson, Maryland, 21252, USA
2 - Towson University, Biological Sciences, 341 Smith Hall, Towson, Maryland, 21252, USA

Keywords:
Astereae
Chrysothamnus
chloroplast DNA
nuclear genes.

Presentation Type: Oral Paper:Papers for Sections
Session: CP15
Location: Lake Erie/Hilton
Date: Monday, July 9th, 2007
Time: 4:15 PM
Number: CP15012
Abstract ID:1718


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