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Origin and evolution of North American Polyploid Silene (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.
2007 (English)In: American Journal of Botany, ISSN 0002-9122, E-ISSN 0032-0919, Vol. 94, no 3, 330-349 p.Article in journal (Refereed) Published
Abstract [en]

Nuclear DNA sequences from introns of the low-copy nuclear gene family encoding the second largest subunit of RNA polymerases and the ribosomal internal transcribed spacer (ITS) regions, combined with the psbE-petL spacer and the rps16 intron from the chloroplast genome were used to infer origins and phylogenetic relationships of North American polyploid Silene species and their closest relatives. Although the vast majority of North American Silene species are polyploid, which contrasts to the diploid condition dominating in other parts of the world, the phylogenetic analyses rejected a single origin of the North American polyploids. One lineage consists of tetraploid Silene menziesii and its diploid allies. A second lineage, Physolychnis s.l., consists of Arctic, European, Asian, and South American taxa in addition to the majority of the North American polyploids. The hexaploid S. hookeri is derived from an allopolyploidization between these two lineages. The tetraploid S. nivea does not belong to any of these lineages, but is closely related to the European diploid S. baccifera. The poor resolution within Physolychnis s.l. may be attributed to rapid radiation, recombination among homoeologues, homoplasy, or any combination of these factors. No extant diploid donors could be identified in Physolychnis s.l.

Place, publisher, year, edition, pages
2007. Vol. 94, no 3, 330-349 p.
Keyword [en]
Caryophyllaceae, cpDNA, low-copy nuclear DNA, molecular phylogeny, North America, rapid radiation, RNA polymerase, Silene
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-91244DOI: 10.3732/ajb.94.3.330ISI: 000245097500005OAI: oai:DiVA.org:uu-91244DiVA: diva2:163907
Available from: 2004-01-13 Created: 2004-01-13 Last updated: 2011-02-09Bibliographically approved
In thesis
1. Disentangling the Reticulate History of Polyploids in Silene (Caryophyllaceae)
Open this publication in new window or tab >>Disentangling the Reticulate History of Polyploids in Silene (Caryophyllaceae)
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

DNA sequences from the rps16 intron and the psbE-petL spacer from the chloroplast genome, the ribosomal nuclear ITS region, and introns from the low copy nuclear genes RPA2, RPB2, RPD2a and RPD2b, are in different combinations used to infer phylogenetic relationships in Sileneae (Caryophyllaceae). Used in concert, the biparentally inherited nuclear regions are useful to distinguish between paralogy due to allopolyploidy and single gene duplications, respectively, because the latter are not expected to give rise to repeated phylogenetic patterns in potentially unlinked sequence regions. In addition, the sequences resolve previously poorly known relationships in the tribe Sileneae. Several independent losses and incomplete concerted evolution are inferred between the two RPD2 paralogues in a subgroup of Silene.

An allopolyploid origin is suggested for the tetraploid S. aegaea, with the maternal ancestor from the diploid S. pentelica lineage, and the paternal contributor from the diploid S. sedoides lineage.

Silene involucrata originated as an allotetraploid with the diploid lineage of Arctic S. uralensis as cytoplasmic donor and the diploid Siberian/Northeast Asian S. ajanensis lineage as pollen donor. A subsequent allopolyploidization with the S. ajanensis lineage as pollen donor and the tetraploid S. involucrata lineage as cytoplasmic donor resulted in the hexaploid lineage of S. sorensenis sensu lato.

A monophyletic origin of the North American polyploids is rejected. One lineage consists of tetraploid S. menziesii and its diploid allies. A separate lineage leads to a clade consisting of both diploid and polyploid Arctic, European and Asian taxa in addition to the majority of the North American polyploids. The tetraploid S. californica and the hexaploid S. hookeri are derived from separate allopolyploidization events between these two lineages.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2004. 20 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 924
Keyword
Biology, Silene, Sileneae, polyploidy, low copy nuclear DNA, RNA polymerase, RPA2, RPB2, RPD2, internal transcribed spacer, rps16, psbE-petL, concerted evolution, reticulate evolution, lineage sorting, Biologi
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-3918 (URN)91-554-5845-9 (ISBN)
Public defence
2004-02-06, Lindahlsalen, EBC, Norbyvägen 18 A, Uppsala, 10:00
Opponent
Supervisors
Available from: 2004-01-13 Created: 2004-01-13 Last updated: 2011-03-07Bibliographically approved

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