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The Origin and number of introductions of the Hawaiian endemic Silene species (Caryophyllaceae)
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Systematisk botanik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Systematisk botanik.
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2007 (Engelska)Ingår i: American Journal of Botany, ISSN 0002-9122, E-ISSN 1537-2197, Vol. 94, nr 2, s. 210-218Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2007. Vol. 94, nr 2, s. 210-218
Nyckelord [en]
Caryophyllaceae, Hawaiian Silene, ITS, phylogeny, RPB2, rps16, Silene antirrhina, woodiness
Nationell ämneskategori
Biologiska vetenskaper
Identifikatorer
URN: urn:nbn:se:uu:diva-95251DOI: 10.3732/ajb.94.2.210ISI: 000244241800008OAI: oai:DiVA.org:uu-95251DiVA, id: diva2:169391
Tillgänglig från: 2006-11-28 Skapad: 2006-11-28 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
Ingår i avhandling
1. Systematics in Sileneae (Caryophyllaceae) – Taxonomy and Phylogenetic patterns
Öppna denna publikation i ny flik eller fönster >>Systematics in Sileneae (Caryophyllaceae) – Taxonomy and Phylogenetic patterns
2006 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2006. s. 37
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 251
Nyckelord
Sileneae, Silene, RNAP, psbE-petG, ITS, rps16, relative dating, Rigidulae, Heliosperma, Arenosae, phylogeny, homoploid reticulate evolution, Silene linearis Decne., Silene polyphylla L., Hawaiian Silene
Nationell ämneskategori
Biologisk systematik
Identifikatorer
urn:nbn:se:uu:diva-7380 (URN)91-554-6749-0 (ISBN)
Disputation
2006-12-19, Lindahlsalen, EBC, Norbyvägen 18A, Uppsala, 09:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2006-11-28 Skapad: 2006-11-28 Senast uppdaterad: 2009-04-02Bibliografiskt granskad

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