A phylogenetic analysis of the aureoidSenecio (Asteraceae) complex based on ITS sequence data |
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Authors: | J. F. Bain R. K. Jansen |
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Affiliation: | (1) Department of Biological Sciences, University of Lethbridge, T1K 3M4 Lethbridge, Alberta, Canada;(2) Department of Botany, University of Texas, 78713-7640 Austin, Texas, USA |
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Abstract: | The internal transcribed spacer region of the 18S–25S nuclear ribosomal DNA repeat was sequenced from 28 populations of the aureoidSenecio complex as well as two populations from the Lugentes group and one from the Tephroseroid group. Divergence levels for populations within the aureoid complex are very low (0.0 to 4.1%). Phylogenetic trees generated from the sequence data provide no support for the recognition of Aurei, Tomentosi and Lobati subgroups within the aureoid complex. With two Lugentes and one Tephroseroid species as outgroups,Senecio glabellus is the sister group of the rest of the aureoids. The high level of divergence between the aureoids and the three outgroup species indicates that the Lugentes and the Tephroseroids may not be closely related to the aureoids. |
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Keywords: | Asteraceae Senecioneae Senecio aureoid complex Packera Internal transcribed spacer (ITS) systematics |
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