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The Origin and number of introductions of the Hawaiian endemic Silene species (Caryophyllaceae)
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Systematic Botany.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Systematic Botany.
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2007 (English)In: American Journal of Botany, ISSN 0002-9122, E-ISSN 1537-2197, Vol. 94, no 2, 210-218 p.Article in journal (Refereed) Published
Abstract [en]

The Hawaiian endemic Silene are a small group of woody or semiwoody representatives from a large, predominantly herbaceous, species-rich genus. We here investigated the origin and number of introductions of the endemic Hawaiian Silene based on phylogenetic relationships inferred from DNA sequences from both the plastid (the rps16 intron) and the nuclear (ribosomal internal transcribed sequences, ITS, and intron 23 of the RPB2 gene) genomes. Silene antirrhina, a widespread weedy American annual, is strongly supported as sister to a monophyletic group consisting of the Hawaiian Silene, indicating a single colonization event. There are no obvious morphological similarities between S. antirrhina and any of the species of Hawaiian Silene. Our results suggest an American origin for the Hawaiian endemics because that would require only a single trans-ocean dispersal. Two of the Hawaiian endemics (S. struthioloides and S. hawaiiensis) that form a subclade in the analyses have evolved woodiness after introduction to the Hawaiian Islands. Our results contribute to other recent results based on molecular phylogenetics that emphasize the American continent as a source area for the Hawaiian flora and support a striking morphological radiation and evolution of woodiness from a single introduction to the archipelago.

Place, publisher, year, edition, pages
2007. Vol. 94, no 2, 210-218 p.
Keyword [en]
Caryophyllaceae, Hawaiian Silene, ITS, phylogeny, RPB2, rps16, Silene antirrhina, woodiness
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-95251DOI: 10.3732/ajb.94.2.210ISI: 000244241800008OAI: oai:DiVA.org:uu-95251DiVA: diva2:169391
Available from: 2006-11-28 Created: 2006-11-28 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Systematics in Sileneae (Caryophyllaceae) – Taxonomy and Phylogenetic patterns
Open this publication in new window or tab >>Systematics in Sileneae (Caryophyllaceae) – Taxonomy and Phylogenetic patterns
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The focus for the first part of the thesis is on the systematics of species belonging to Silene subgenus Silene. Phylogenetic relationships are inferred from DNA sequences from both the plastid (the rps16 intron) and the nuclear (ITS, intron of the RPB2 gene) genomes. Silene section Rigidulae is shown to be non-monophyletic in its previous circumscription, but instead consisting of six separate clades, each correlated to the geographical distribution of the included species. The taxonomic consequences for each clade are discussed. One of the clades is recognized as a new section and described as Silene sect. Arenosae sect. nov. The morphological descriptions of the species are formalized using a novel implementation of the Prometheus Description Model. Two proposals are included in the thesis, one to reject the name Silene polyphylla L., which is a senior synonym to S. portensis L. Silene linearis Decne. is proposed for conservation against the rarely used S. linearis Sweet.

Silene antirrhina, a weedy American annual, is strongly supported as sister to the Hawaiian endemic species of Silene, suggesting an American origin for these. Two of the endemics have evolved woodiness after introduction to Hawaii.

In the second part of the thesis we use four nuclear DNA regions, (introns from RPA2, RPB2, RPD2a, RPD2b), and the chloroplast psbE-petG spacer. A framework is developed to evaluate different phylogenetic explanations for conflicting gene trees, where divergence times are used to discriminate among inter- and intralineage processes. The incongruences observed regarding the relationships among the three major lineages of Heliosperma are best explained by homoploid hybridization. The pattern regarding the origin of Heliosperma itself is more complicated and is likely to include several reticulate events. Two lineages have probably been involved in the origin of Heliosperma, one leading to Viscaria and Atocion and the other to Eudianthe and/or Petrocoptis.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. 37 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 251
Keyword
Sileneae, Silene, RNAP, psbE-petG, ITS, rps16, relative dating, Rigidulae, Heliosperma, Arenosae, phylogeny, homoploid reticulate evolution, Silene linearis Decne., Silene polyphylla L., Hawaiian Silene
National Category
Biological Systematics
Identifiers
urn:nbn:se:uu:diva-7380 (URN)91-554-6749-0 (ISBN)
Public defence
2006-12-19, Lindahlsalen, EBC, Norbyvägen 18A, Uppsala, 09:00 (English)
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Available from: 2006-11-28 Created: 2006-11-28 Last updated: 2009-04-02Bibliographically approved

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