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MOLECULAR PHYLOGENY OF THE EDELWEISS (LEONTOPODIUM, ASTERACEAE – GNAPHALIEAE)

Published online by Cambridge University Press:  28 May 2010

C. Blöch ,
W. B. Dickoré ,
R. Samuel  and
T. F. Stuessy
C. Blöch*
Affiliation:
Department of Systematic and Evolutionary Botany, Faculty Centre of Biodiversity, University of Vienna, Rennweg 14, 1030 Wien, Austria. E-mail for correspondence: cordula.bloech@univie.ac.at
W. B. Dickoré
Affiliation:
Department of Vascular Plants, Botanische Staatssammlung, Menzinger Str. 67, 80638 München, Germany.
R. Samuel
Affiliation:
Department of Systematic and Evolutionary Botany, Faculty Centre of Biodiversity, University of Vienna, Rennweg 14, 1030 Wien, Austria. E-mail for correspondence: cordula.bloech@univie.ac.at
T. F. Stuessy
Affiliation:
Department of Systematic and Evolutionary Botany, Faculty Centre of Biodiversity, University of Vienna, Rennweg 14, 1030 Wien, Austria. E-mail for correspondence: cordula.bloech@univie.ac.at
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Abstract

Leontopodium is a genus of approximately 30 species with a conspicuous Asian–European disjunct distribution. In this study samples from the Himalayan/Tibetan centre of diversity of the genus, as well as from Europe, were analysed to infer a phylogeny of the genus using sequences of nuclear ribosomal (ITS and ETS) and plastid (matK and trnL/F) DNA. The Southeast Tibetan monotypic Sinoleontopodium [Leontopodium lingianum (Y.L.Chen) Dickoré, comb. nov.] falls into Leontopodium. Monophyly of Leontopodium, including Sinoleontopodium, is supported. Due to low rates of sequence divergence, intrageneric relationships in general are weakly supported, a pattern frequently observed in plant groups centred in the Tibetan Plateau. Three phylogenetic groups can be identified, however, and these are also supported by morphology. The low levels of nucleotide divergence suggest a young age for the group, which has been influenced by the turbulent geological history of the Tibetan Plateau. Leontopodium is a characteristic Sino-Himalayan element that appears to have found its way into the mountains of Europe in geologically recent times. The two European taxa, Leontopodium alpinum and L. nivale, form a genetically distinct group, which, considering the wide geographic disjunction, shows surprisingly little divergence from its Asian relatives.

Keywords

AsteraceaeETSGnaphalieaeITSLeontopodiummatKmolecular phylogenySino-Himalayan floraSinoleontopodiumtrnL/F
Type
Articles
Information
Edinburgh Journal of Botany , Volume 67 , Issue 2 , July 2010 , pp. 235 - 264
Copyright
Copyright © Trustees of the Royal Botanic Garden Edinburgh 2010

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