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Phylogenetic relationships among endemic Hawaiian Lysimachia (Myrsinaceae): insights from nuclear and chloroplast DNA sequence data
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolutionary Biology, Systematic Botany.
Department of Botany, Stockholm University, Lilla Frescativägen 5, SE-106 91 Stockholm, Sweden.
Department of Biological Sciences, 110 Mills Godwin Building/45th Street, Old Dominion University, Norfolk, Virginia 23529-0266 U.S.A..
Laboratory for Molecular Systematics, Swedish Museum of Natural History, P.O. Box 50007, SE-104 05 Stockholm, Sweden.
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2013 (English)In: Pacific Science, ISSN 0030-8870, E-ISSN 1534-6188, Vol. 67, no 7, 237-251 p.Article in journal (Refereed) Published
Abstract [en]

The 16 endemic Hawaiian species of Lysimachia form a monophyletic group referred to as subgenus Lysimachiopsis (Marr and Bohm 1997). The group has radiated into various habitats and most species are endemic to a single island. Previous taxonomic treatments have revealed problems, particularly within the L. hillebrandii/L. remyi complex. We conducted phylogenetic analyses including 12 species of the subgenus Lysimachiopsis using nuclear ribosomal DNA (ETS, ITS) and chloroplast DNA (rpl16, rpl20-rps12, rps16, trnH-psbA, trnS-G) sequences in order to reconstruct phylogenetic relationships. A combined analysis using all sequence data supports three major clades and provides new insights into the evolutionary history of the group, especially within the problematic L. hillebrandii/L. remyi complex. The resulting molecular phylogeny provides support for the following clades: (1) L. hillebrandii and L. waianaeensis, (2) L. remyi ssp. remyi, L. maxima, and L. remyi ssp. subherbacea, (3) L. remyi ssp. caliginis and L. remyi ssp. kipahuluensis, and (4) L. glutinosa, L. scopulensis, and L. kalalauensis. The phylogenetic pattern is largely congruent with the biogeographical distribution of the species in the Hawaiian Islands. Our results also indicate that earlier taxonomic treatments of the group need to be partially revised in order to reflect phylogenetic relationships.

Place, publisher, year, edition, pages
2013. Vol. 67, no 7, 237-251 p.
Keyword [en]
cpDNA; nrDNA; Hawaii; Lysimachia; molecular phylogeny; Myrsinaceae; taxonomy
National Category
Biochemistry and Molecular Biology
Research subject
Systematic Botany
Identifiers
URN: urn:nbn:se:uu:diva-100371DOI: 10.2984/67.2.7ISI: 000329330000007OAI: oai:DiVA.org:uu-100371DiVA: diva2:210187
Available from: 2009-03-31 Created: 2009-03-31 Last updated: 2017-12-13
In thesis
1. Comparative Seed Morphology and Phylogenetics: Case Studies in Basal Angiosperms (ANITA) and Asterids (Lysimachia, Ericales)
Open this publication in new window or tab >>Comparative Seed Morphology and Phylogenetics: Case Studies in Basal Angiosperms (ANITA) and Asterids (Lysimachia, Ericales)
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The first half of the thesis deals with the seed morphology of members of the ANITA grade at the base of the angiosperm phylogeny (Amborella, Nymphaeales, Illiciales, Trimeniaceae, and Austrobaileyaceae), especially Illiciaceae and Schisandraceae. Seed characters support a major division between the New World and Old World species of Illicium. Fossil seeds previously assigned to Illiciaceae were re-evaluated. In Schisandraceae, seed and leaf epidermal characters were added to a previously published morphological data matrix. Phylogenetic analysis using the extended data matrix shows that Kadsura and Schisandra appear to be supported as monophyletic sister taxa by a number of synapomorphies in reproductive and vegetative characters. Fossil seeds from the Eocene of North America show some similarities to the modern Schisandra glabra from North America, whereas fossils from Europe are more similar to modern Asian species.

In the second half of the thesis, seed morphology of Lysimachia and closely related taxa (Anagallis, Ardisiandra, Asterolinon, Glaux, Pelletiera, Trientalis) was investigated. The phylogenetic relationships among the endemic Hawaiian species of Lysimachia was also studied, using nuclear ribosomal DNA (ETS, ITS) and chloroplast DNA (rpl16, rpl20-rps12, rps16, trnH-psbA, trnS-G) sequence data. The seeds in Lysimachia and related taxa vary in, e.g., shape, seed coat structure and surface patterns. Seed surface patterns are mostly congruent with molecular phylogenetic relationships. A reticulate surface pattern is diagnostic for, e.g., the subgenus Palladia and the Hawaiian endemic subgenus Lysimachiopsis. Mapping seed characters onto a recent molecular-based phylogenetic tree, reveals that they provide potentially synapomorphic character states for various subclades of Lysimachia. The phylogenetic analysis based on the combined data set using nuclear ribosomal DNA and chloroplast DNA data provides new insights into the relationships within the Hawaiian subgenus Lysimachiopsis. Here our results indicate that earlier taxonomic treatments of the group need to be partially revised.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 38 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 634
Series
National Category
Biological Sciences
Research subject
Systematic Botany
Identifiers
urn:nbn:se:uu:diva-100372 (URN)978-91-554-7497-3 (ISBN)
Public defence
2009-05-15, Lindahlsalen, EBC, Norbyvägen 18A, Uppsala, 10:00 (English)
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Available from: 2009-04-23 Created: 2009-03-31 Last updated: 2009-04-23Bibliographically approved

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