Systematics/Phytogeography / Taxonomie/ Section
Englund, Markus , Pornpongrungrueng, Pimwadee , Gustafsson, Mats H. G. , Anderberg, Arne A. .
Phylogenetic relationships in Inuleae-Inulinae (Asteraceae) based on DNA sequence data from ITS and three chloroplast loci.
Inuleae-Inulinae comprises about 400 species of herbs and shrubs classified in 27 different genera. The large genera Blumea, Inula, and Pulicaria dominate the group and include together more than two thirds of the species. The subtribe Inulinae is widely distributed in the Old World with centers of diversity in tropical Asia and in the Macaronesian, Mediterranean, and Saharo-Arabian regions. In order to investigate the intergeneric relationships and to clarify generic limits within the subtribe, we used DNA sequence data from three coding and non-coding chloroplast regions (ndhF, trnL-F, psbA-trnH) and from the nuclear ribosomal internal transcribed spacer (ITS) region. Data from different regions were analyzed separately and in combination using parsimony and Bayesian methods. The large, heterogeneous and widespread genera Inula and Pulicaria are not monophyletic. A monophyletic group (“the Inula complex”) that comprises all species of Inula includes also Amblyocarpum, Carpesium, Chrysophthalmum, Telekia, Rhanteriopsis, and Pentanema sensu stricto. Two species of Pentanema were found to be closer to Blumea (including Blumeopsis and Merrittia), and Caesulia. A second large monophyletic group, “the Pulicaria complex”, includes all taxa with heteromorphic pappus, but also genera such as Vieria and Dittrichia. Within this group, Francoeuria is distinct from Pulicaria and merits recognition as a separate genus. Important characters to distinguish genera within the subtribe, such as presence or absence of receptacular scales and type of pappus, are shown to be highly homoplasious and in need of reevaluation. Different phylogenetic signals from chloroplast and nuclear data also indicate a reticulate evolutionary history in the group.
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1 - Stockholm University, Department of Botany, Lilla Frescativägen 5, Stockholm, SE-10691, Sweden
2 - Khon Kaen University, Applied Taxonomic Research Center, Department of Biology, Faculty of Science, Khon Kaen, 40002, Thailand
3 - University of Aarhus, Systematic Botany, Institute of Biological Sciences, Ole Worms Allé, building 1137, Aarhus C, 1137, Denmark
4 - Swedish Museum of Natural History, Department of Phanerogamic Botany, P.O. Box 50007, Stockholm, SE-104 05, Sweden
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, July 30th, 2008
Time: 5:15 PM