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Abstract Detail


Systematics Section / ASPT

Barniske, Anna-Magdalena [1], Borsch, Thomas [2], Worberg, Andreas [2], Müller, Kai [2], Quandt, Dietmar [1].

Corroborating the branching order among basal Eudicots: more insights from more rapidly evolving and non-coding DNA.

Analyses of non-coding and rapidly evolving DNA from the chloroplast genome's single copy regions (trnL-F, petD intron, matK) has recently yielded well supported phylogenetic hypotheses for basal eudicots, with Ranunculales as first branching lineage, followed by Sabiales, Proteales, Trochodendrales, Buxales and the core eudicots. Under parsimony, high resolution and statistical support was obtained for all deep nodes of the basal eudicot grade. In model based approaches, the position of Sabiales was lacking support, however. By adding and analysing further sequence data from two more group II introns (rpL16, trnK) as well as the atpB-rbcL spacer an enhanced phylogenetic signal finally resolves the position of Sabiales among basal eudicots.
It appears that the combined analysis of sequence data from rapidly evolving and non-coding genomic regions leads to significantly improved statistical support values on all levels in comparison to earlier studies of basal eudicots using multiple conserved genes. As this is attributed to different underlying evolutionary constrains within non-coding regions, we performed partitioned analyses considering functional and structural aspects, in order to trace e.g. the contributions of core versus peripherical intron elements or helical versus loop structures etc.


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1 - Technische Universität Dresden, Botany, Plant Phylogenetics & Phylogenomics Group, Zellescher Weg 20b, Dresden, 01217, Germany
2 - Rheinische Friedrich-Wilhelms-Universität Bonn, Nees-Institut für Biodiversität der Pflanzen, Meckenheimer Allee 170, Bonn, D-53115, Germany

Keywords:
basal eudicots
Sabiales
non-coding DNA
fast-evolving DNA
secondary structure.

Presentation Type: Oral Paper:Papers for Sections
Session: CP42
Location: Boulevard C/Hilton
Date: Wednesday, July 11th, 2007
Time: 9:30 AM
Number: CP42007
Abstract ID:1627


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