Systematics Section / ASPT
Worberg, Andreas , Quandt, Dietmar , Korotkova, Nadja , Borsch, Thomas .
Phylogenetic analysis of Rosids using fast evolving and non-coding chloroplast markers.
Rosids comprise about 30% of the eudicot diversity and contain more than 70,000 species in 140 families and 14 orders. Altough two major clades within rosids, the malvids and fabids, are supported by various molecular studies, there are still many open questions regarding the phylogeny of rosids. We applied sequence data of the rapidly evolving matK gene, the group II trnK intron, the group I trnL intron and the trnL-F spacer, covering most rosid families with an outgroup of early branching eudicots. The dataset comprised ~6,000 positions of aligned sequence plus a separate binary indel matrix. Like in datasets of these markers for other major clades of angiosperms, sequence alignment was reliable when certain mutational hotspots were excluded. These mutational hotspots are located in terminal parts of stem-loop regions P6 and P8 of the group I intron and in domains I and IV of the group II intron. Increased support is found for example for a Oxalidales plus Celastrales clade as sister to Malpighiales; for a Brassicales plus Malvales clade that is sister to Sapindales (all three form the malvids): or for a position of Tapiscia sister to the Brassicales-Malvales clade. Combined analysis of sequence data from rapidly evolving and non-coding chloroplast genomic regions in rosids leads to significantly raised node support across the tree, and provides evidence for positioning of yet unplaced families.
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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
Presentation Type: Oral Paper:Papers for Sections
Location: Stevens 3/Hilton
Date: Wednesday, July 11th, 2007
Time: 5:00 PM