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Phylogenetic relationships of Atocion and Viscaria (Sileneae, Caryophyllaceae) inferred from chloroplast, nuclear ribosomal, and low-copy gene DNA sequences
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Systematic Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Systematic Biology.
2009 (English)In: Taxon, ISSN 0040-0262, E-ISSN 1996-8175, Vol. 58, no 3, 811-824 p.Article in journal (Refereed) Published
Abstract [en]

Atocion and Viscaria are two of seven small genera recognised in the   tribe Sileneae on the basis of molecular phylogenies. The aim of the   present study is to infer phylogenetic relationships among their  subordinate taxa, using chloroplast (rps16 intron,psbE-petG spacer   region) and nuclear (ITS and the RNA polymerase gene family) DNA   sequences. Relative dating was used to discriminate among intralineage   and interlineage processes that cause incongruence among different   gene-tree topologies. Atocion asterias is demonstrated to belong to   Viscaria, which contains three species: V vulgaris (incl. V   atropurpurea), V alpina, and V asterias. Infraspecific differentiation   of V alpina is not supported by the sequence data. The traditional   sectional delimitation of Atocion taxa within Silene is not supported   phylogenetically, and Silene tatarinowii as well as S. hoefftiana do   not belong to Atocion, as classified previously. Atocion contains six   species: A. armeria, A. compactum, A. lerchenfeldianum, A. reuterianum,   A. rupestre, and A. scythicinum (not included in our study). With this   circumscription, Atocion and Viscaria, respectively, form monophyletic   groups in the cpDNA, ITS, RPD2a and RPD2b trees, but not in the RPA2   tree, where such relationships were possibly distorted by ancient   hybridisation. Hybridisation with subsequent chloroplast capture is   likely to have taken place in the evolutionary history of A. compactum.   Three novel nomenclatural combinations are made: Atocion reuterianum,  A. scythicinum and Viscaria asterias.

Place, publisher, year, edition, pages
2009. Vol. 58, no 3, 811-824 p.
Keyword [en]
BEAST, Lychnis sect. Viscaria, RPA2, RPD2a, RPD2b, Silene sect. Compactae, Silene sect. Rupifraga
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-96105ISI: 000269774900010OAI: oai:DiVA.org:uu-96105DiVA: diva2:170570
Available from: 2007-09-05 Created: 2007-09-05 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Taxonomy and Reticulate Phylogeny of Heliosperma and Related Genera (Sileneae, Caryophyllaceae)
Open this publication in new window or tab >>Taxonomy and Reticulate Phylogeny of Heliosperma and Related Genera (Sileneae, Caryophyllaceae)
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Heliosperma (nom. cons prop.) comprises 15—20 taxa, most of them endemic to the Balkan Peninsula. DNA sequences from the chloroplast (rps16 intron, psbE-petG spacer) and the nuclear genome (ITS and four putatively unlinked RNA polymerase genes) are used to elucidate phylogenetic relationships within Heliosperma, and its position within Sileneae. Three main lineages are found within Heliosperma: Heliosperma alpestre, H. macranthum and the H. pusillum-clade. The relationships among the lineages differ between the plastid and the nuclear trees. Relative dates are used to discriminate among inter- and intralineage processes causing such incongruences, and ancient homoploid hybridisation is the most likely explanation.

The chloroplast data strongly support two, geographically correlated clades in the H. pusillum-group, whereas the relationships appear poorly resolved by the ITS data, when analysed under a phylogenetic tree model. However, a network analysis finds a geographic structuring similar to that in the chloroplast data. Ancient vicariant divergence followed by hybridisation events best explains the observed pattern. The morphological and taxonomical diversity in the H. pusillum-group is possibly ecology-induced, and is not correlated with the molecular data.

Phylogenetic patterns regarding the origin of Heliosperma are complicated, probably influenced by reticulate and sorting events. At least two ancient lineages have been involved in its evolution, one most closely related to Viscaria/Atocion and the other to Eudianthe/Petrocoptis.

Atocion and Viscaria are sister genera, most species-rich on the Balkans, and including six/three species. Phylogenies do not support their traditional classification, and provide a framework for a taxonomic revision. Atocion compactum is found in three different positions in the chloroplast tree, and in a single clade in the nuclear gene trees. Using relative dates we demonstrate that hybridisation with subsequent chloroplast capture is a feasible explanation for the pattern observed. This, and other observed reticulate patterns, highlights the importance of hybridisation in plant evolution.

Place, publisher, year, edition, pages
Uppsala: Universitetsbiblioteket, 2007. 34 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 328
Keyword
Sileneae, Silene, Heliosperma, Atocion, Viscaria, taxonomy, phylogenetics, relative dating, reticulate evolution, chloroplast capture, homoploid hybridisation, BEAST, r8s, PATHd8, Prometheus, RPA2, RPB2, RPD2a, RPD2b, Balkan Peninsula, endemics
National Category
Biological Systematics
Identifiers
urn:nbn:se:uu:diva-8171 (URN)978-91-554-6946-7 (ISBN)
Public defence
2007-09-27, Lindahlsalen, EBC, Norbyvägeb 18A, Uppsala, 10:00
Opponent
Supervisors
Available from: 2007-09-05 Created: 2007-09-05 Last updated: 2010-07-07Bibliographically approved

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