Abstract
Sequences of the internal transcribed spacers (ITS1 and ITS2) of nuclear ribosomal
DNA were analysed for 44 Artemisia species (46 populations) representing all the five classical subgenera and the geographical
range of the genus, 11 species from 10 genera closely related to Artemisia, and six outgroup species from five other genera of the Anthemideae. The results definitely
support the monophyly of the genus Artemisia in its broadest sense (including some taxa segregated as independent genera, like
Oligosporus and Seriphidium ). Eight main clades are established in this molecular phylogeny within Artemisia; they agree in part with the classical subdivision of the genus, but they also suggest
that some infrageneric groups must be redefined, especially the subgenus Artemisia. The subgenera Tridentatae and Seriphidium are independent from each other. Some of the satellite genera are clearly placed
within Artemisia (Artemisiastrum, Filifolium, Mausolea, Picrothamnus, Sphaeromeria, Turaniphytum ), whereas some others fall outside the large clade formed by this genus (Brachanthemum, Elachanthemum, Hippolytia, Kaschgaria). Our results, correlated to other data such as pollen morphology, allow us to conclude
that the subtribe Artemisiinae as currently defined is a very heterogeneous group.
Affinities of the largest genus of the subtribe and tribe, Artemisia, and of other genera of the subtribe to some genera from other subtribes of the Anthemideae
strongly suggest that subtribe Artemisiinae needs a deep revision and redefinition.
Phylogenetic utility of region trnL-F of the plastid DNA in the genus Artemisia and allies was also evaluated: sequences of the trnL-F region in Artemisia do not provide phylogenetic information.
Key words
Artemisia
- Artemisiinae - Anthemideae - Asteraceae - Compositae - nrDNA ITS - molecular phylogeny.
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J. Vallès
Laboratori de Botànica Facultat de Farmàcia Universitat de Barcelona
Av. Joan XXIII, s/n
08028 Barcelona
Catalonia, Spain
Email: avalles@farmacia.far.ub.es
Section Editor: F. Salamini