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Abstract Detail

Systematics Section / ASPT

Worberg, Andreas [1], Quandt, Dietmar [2], Barniske, Anna-Magdalena [2], Löhne, Cornelia [1], Hilu, Khidir W. [3], Borsch, Thomas [1].

Towards understanding early Eudicot diversification: insights from rapidly evolving and non-coding DNA.

THE analysis of non-coding and rapidly evolving DNA from the chloroplast genome's single copy regions has recently yielded well supported phylogenetic hypotheses for basal angiosperms.
We applied sequence data from a series of group I and II introns, spacers and the matK gene from all families of the basal eudicot grade, representatives of 19 core eudicot orders, and an outgroup comprising taxa from basal angiosperms to phylogenetic analysis. The dataset comprised 6100 positions of aligned sequence plus a separate binary indel matrix. Mutational hotspots corresponded in number and extension to hotspots already known from basal angiosperms and, with respect to secondary structure, are located in certain terminal parts of the stem-loop regions.
Ranunculales are resolved as sister to the remaining eudicots, followed by Sabiales, Proteales, Trochodendrales, Buxales and the core eudicots. All deeper nodes and the respective crown groups gained high Jackknife support. Within Ranunculales the woody Eupteleaceae are first-branching, with Papaveraceae plus Fumariaceae coming next. Within Proteales Nelumbo is clearly resolved as sister to a Platanaceae-Proteaceae clade. Gunnerales as composed of Gunneraceae and Myrothamnaceae are the first branch of the core eudicots, a position also well supported. The evolution for a large number of microstructural mutations is reconstructed, many of which are synapomorphic for deeper nodes.

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eudicot evolutionary research

1 - Rheinische Friedrich-Wilhelms-Universität Bonn, Nees-Institut für Biodiversität der Pflanzen, Meckenheimer Allee 170, Bonn, D-53115, Germany
2 - Dresden University of Technology, Institute of Botany, Plant Phylogenetics & Phylogenomics Group, Dresden, D-01062, Germany
3 - Virginia Polytechnic Institute and State University, Department of Biology, Blacksburg, Virginia, 24061, USA

noncoding regions
fast evolving genomic regions

Presentation Type: Oral Paper:Papers for Sections
Session: 31-15
Location: 144/Performing Arts Center
Date: Tuesday, August 1st, 2006
Time: 12:00 PM
Abstract ID:576

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