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Abstract Detail


Systematics Section

Worberg , Andreas [1], Quandt, Dietmar [1], Korotkova, Nadja [1], Müller, Kai [1], Wicke, Susann [2], Borsch, Thomas [3].

`Very large´, `poorly understood´ but `well supported´ – The Phylogeny of Rosids based on fast evolving and non-coding chloroplast markers.

The rosids represent one of the major angiosperm clades, constituting about one third of all flowering plants and about 40% of the eudicots (more than 70,000 species). Despite recent advances, knowledge about relationships among rosids still remains limited. This is particularly true for rapid radiations within rosids, such as Malpighiales.
Our Eudicot Evolutionary Research team analysed sequence data from 197 taxa of the rapidly evolving matK gene, the group II trnK intron, the group I trnL intron and the trnL-F spacer from nearly all families of the rosids, comprising all major lineages, as well as Vitales and Saxifragales and an outgroup of basal eudicots in a combined matrix. The dataset comprised >13,000 positions of aligned sequence data plus a separate binary indel matrix adding another 2000 characters. Compared to previous analyses, the combined dataset yields significantly increased resolution and support in MP, Bayesian and Likelihood inferences. This is particularly obvious within Fabids and Malvids, including the order Huerteales as recently newly circumscribed by our group. Further, the isolated clades of Geraniales, Myrtales and Crossosomatales can be placed with statistical support. In order to understand the high performance of the spacer and both introns, as well as matK we analysed the phylogenetic structure within and among data partitions in comparison to more conserved genes (e.g. rbcL) using a PERL pipeline. Results underscore that the phylogenetic structure is highest in the spacer and group I intron, followed by group II intron and matK sequences, independently from the tree inference method. Reconstructions of intron secondary structures are addressed as a framework to understand molecular evolutionary patterns governing the performance as phylogenetic markers.


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Eudicot Evolutionary Research Group


1 - Rheinische Friedrich-Wilhelms-Universität Bonn, Nees-Institut für Biodiversität der Pflanzen, Meckenheimer Allee 170, Bonn, D-53115, Germany
2 - University of Vienna, Department of Systematic and Evolutionary Botany, Rennweg 14, Vienna, Vienna, A-1030, Austria
3 - Botanischer Garten und Botanisches Museum Berlin-Dahlem, Freie Universität Berlin, Königin-Luise-Strasse 6-8, Berlin, D-14195, Germany

Keywords:
eudicots
rosids
non-coding DNA
fast-evolving DNA
phylogenetic structure.

Presentation Type: Oral Paper:Papers for BSA Sections
Session: 2
Location: Alpine C/Snowbird Center
Date: Monday, July 27th, 2009
Time: 8:15 AM
Number: 2002
Abstract ID:752


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