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Resolving maternal relationships in the clubmoss genus Diphasiastrum (Lycopodiaceae)
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.
2009 (English)In: Taxon, ISSN 0040-0262, E-ISSN 1996-8175, Vol. 58, no 3, 835-848 p.Article in journal (Refereed) Published
Abstract [en]

Diphasiastrum comprises 20-30 species. In addition to a number of species with a circumboreal distribution, several island endemics and putative diploid hybrid species contribute to the diversity of the group. To assess the integrity and relationships of the recognized species, a global phylogeny of Diphasiastrum is constructed using five chloroplast regions comprising ~9000 bp. Six monophyletic groups are identified. Accessions identified as hybrid species cluster in all but one case together with one of its putative parents. Two microsatellite loci are identified, and allelic information combined with sequence information is found diagnostic for the three putative parental taxa in the Central Europe hybrid complexes. Haplotype screening is performed on six Central European populations, from where one or more putative diploid hybrid species have been reported to grow in sympatry with their parent species. The most common parental haplotypes are identified in all populations. Additional intraspecific variation, restricted to single populations, is identified in all sympatric populations at very low frequencies. Taking the low degree of sequence and microsatellite variation into consideration, the acknowledged morphological diversity in Central Europe is probably best explained by phenotypic plasticity, ancestral polymorphisms or relatively recent events of reticulate evolution.

Place, publisher, year, edition, pages
2009. Vol. 58, no 3, 835-848 p.
Keyword [en]
Chloroplast microsatellites, Diphasiastrum, Diploid hybrid species, Lycopodium, Lycopodiaceae, Plastid phylogeny
National Category
Biological Sciences
Research subject
Systematic Botany
Identifiers
URN: urn:nbn:se:uu:diva-99576ISI: 000269774900012OAI: oai:DiVA.org:uu-99576DiVA: diva2:208220
Available from: 2009-03-16 Created: 2009-03-16 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Reticulate Evolution in Diphasiastrum (Lycopodiaceae)
Open this publication in new window or tab >>Reticulate Evolution in Diphasiastrum (Lycopodiaceae)
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis relationships and the occurrence of reticulate evolutionary events in the club moss genus Diphasiastrum are investigated. Diphasiastrum is initially established as a monophyletic group within Lycopodiaceae using non recombinant chloroplast sequence data. Support is obtained for eight distinct parental lineages in Diphasiastrum, and relationships among the putative parent taxa in the hypothesized hybrid complexes; D. alpinum, D. complanatum, D. digitatum, D. multispicatum, D. sitchense, D. tristachyum and D. veitchii are presented.

Feulgen DNA image densitometry data and sequence data obtained from three nuclear regions, RPB2, LEAFY and LAMB4, were used to infer the origins of three different taxa confirmed to be allopolyploid; D. zanclophyllum from South Africa, D. wightianum from Malaysia and an undescribed taxon from China. The two Asian polyploids have originated from two different hybrid combinations, D. multispicatum x D. veitchii and D. tristachyum x D. veitchii. Diphasiastrum zanclophyllum originates from a cross between D. digitatum and an unidentified diploid taxon.

The occurrence of three homoploid hybrid combinations commonly recognized in Europe, D. alpinum x D. complanatum, D. alpinum x D. tristachyum and D. complanatum x D. tristachyum, are verified using the same three nuclear regions. Two of the three hybrid combinations are also shown to have originated from reciprocal crosses. Admixture analyses performed on an extended, dataset similarly identified predominately F1 hybrids and backcrosses. The observations and common recognition of hybrid species in the included populations are hence most likely due to frequent observations of neohybrids in hybrid zones. Reticulate patterns are, however, prominent in the presented dataset. Hence future studies addressing evolutionary and ecological questions in Diphasiastrum should emphasize the impact of gene flow between parent lineages rather than speciation as the result of hybridization.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 35 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 623
Keyword
admixture analysis, Bayesian clustering, Diphasiastrum, Feulgen DNA image densitometry, homoploid hybridization, Lycopodiaceae, phylogenetic analysis, polyploidy, reticulate evolution
National Category
Biological Systematics
Research subject
Systematic Botany
Identifiers
urn:nbn:se:uu:diva-99584 (URN)978-91-554-7470-6 (ISBN)
Public defence
2009-04-29, Lindahlsalen, Norbyvägen 18, Uppsala University, 10:00 (English)
Opponent
Supervisors
Available from: 2009-04-08 Created: 2009-03-16 Last updated: 2009-09-14Bibliographically approved

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Aagaard, Sunniva M.D.

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