Systematics Section / ASPT
Gurushidze, Maia , Blattner, Frank R. , Fritsch, Reinhard M. .
Congruent nuclear and chloroplast phylogenies strongly contradict morphology in Allium subgenus Melanocrommyum.
ALLIUM subg. Melanocrommyum (Alliaceae), distributed in Eurasia, comprises 140 mostly diploid species, exclusively adapted to arid conditions. To analyze the phylogenetic relationships within the subgenus the nuclear rDNA internal transcribed spacer (ITS) and chloroplast trnL-trnF regions were analyzed in 300 individuals representing 90 species and most sections and subsections of the subgenus. The groups inferred from ITS sequences do not reflect the current taxonomic classification of the subgenus, as the groups retained are mostly in conflict with the traditional sections. As the phylogenetic analysis of chloroplast trnL-trnF sequences resulted in poorly resolved trees (low resolution in parsimony analysis and low bootstrap support together with high number of zero-length branches in phenetic analysis), we used a genealogical network approach to analyze chloroplast relationships within the subgenus. The network showed that ancient haplotypes, co-occurring with their descendants, are often involved in multifurcating relationships, as they gave rise to multiple chloroplast lineages. The groups found in a statistical parsimony network of 60 haplotypes fully agree with the groups inferred from the nuclear ITS region, and both nuclear and chloroplast phylogenies strongly contradict morphology-based taxonomic sections. To test if the inconsistencies are caused by parallel evolution of morphological traits or due to the chosen molecular markers we aim to use single or low-copy nuclear genes, as they are bi-parentally inherited and are not subject to concerted evolution.[c.e.:srb]
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1 - IPK Gatersleben, Taxonomy & Evol. Biology, Gatersleben, D-06466, Germany
Presentation Type: Poster:Posters for Sections
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM