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Allopolyploidy in Fragariinae (Rosaceae): Comparing four DNA sequence regions, with comments on classification
Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen.
Gothenburg University, Department of Environmental Sciences.
Gothenburg University, Department of Environmental Sciences.
Stockholms universitet, Naturvetenskapliga fakulteten, Botaniska institutionen.
Vise andre og tillknytning
2009 (engelsk)Inngår i: Molecular Phylogenetics and Evolution, ISSN 1055-7903, E-ISSN 1095-9513, Vol. 51, nr 2, s. 269-280Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Potential events of allopolyploidy may be indicated by incongruences between separate phylogenies based on plastid and nuclear gene sequences. We sequenced two plastid regions and two nuclear ribosomal regions for 34 ingroup taxa in Fragariinae (Rosaceae), and six outgroup taxa. We found five well supported incongruences that might indicate allopolyploidy events. The incongruences involved Aphanes arvensis, Potentilla miyabei, Potentilla cuneata, Fragaria vesca/moschata, and the Drymocallis clade. We evaluated the strength of conflict and conclude that allopolyploidy may be hypothesised in the four first cases. Phylogenies were estimated using Bayesian inference and analyses were evaluated using convergence diagnostics. Taxonomic implications are discussed for genera such as Alchemilla, Sibbaldianthe, Chamaerhodos, Drymocallis and Fragaria, and for the monospecific Sibbaldiopsis and Potaninia that are nested inside other genera. Two orphan Potentilla species, P. miyabei and P. cuneata are placed in Fragariinae. However, due to unresolved topological incongruences they are not reclassified in any genus.

sted, utgiver, år, opplag, sider
2009. Vol. 51, nr 2, s. 269-280
HSV kategori
Forskningsprogram
systematisk botanik
Identifikatorer
URN: urn:nbn:se:su:diva-34698DOI: doi:10.1016/j.ympev.2009.02.020ISI: 000265812000012OAI: oai:DiVA.org:su-34698DiVA, id: diva2:285332
Tilgjengelig fra: 2010-01-11 Laget: 2010-01-11 Sist oppdatert: 2017-12-12bibliografisk kontrollert
Inngår i avhandling
1. Systematics and polyploid evolution in Potentilleae (Rosaceae)
Åpne denne publikasjonen i ny fane eller vindu >>Systematics and polyploid evolution in Potentilleae (Rosaceae)
2011 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis comprises studies of the phylogenetic relationships in the flowering plant clade Potentilleae in Rosaceae. The relationships were elucidated by using DNA sequence data from the nuclear genome as well as from the plastid genome. In particular, the focus of the studies was the investigation of allopolyploidy, i.e. speciation as a result of hybridization and subsequent chromosome doubling. A phylogenetic method was used for identifying allopolyploidy through comparison of trees resulting from the analyses of different DNA sequences. Five sub-clades were investigated. First, both the sister clades that together contain all of Potentilleae: Fragariinae and Potentilla. Secondly, three subclades of Fragariinae, namely Alchemilla in wide sense, Sibbaldia and relatives, and Fragaria. The aim was to unravel the phylogenetic relationships, including instances of allopolyploidy. Classification issues were discussed in relation to the phylogenetic results. The split between Potentilla (=Potentillinae) and Fragariinae received better support than in previous studies. The phylogeny of Fragariinae was found to be consistent with classifying ten genera: Alchemilla in wide sense (incl. Aphanes and Lachemilla), Comarum, Sibbaldia, Sibbaldianthe, Sibbaldiopsis, Chamaerhodos, Drymocallis, Dasiphora, Potaninia, Fragaria, and also including a few orphan Potentilla species. The segregated genera Ivesia, Horkelia, Horkeliella and Duchesnea were found to be nested within Potentilla, corroborating earlier studies, while the segregated genus Argentina (P. anserina and close relatives) showed an ambiguous position. Plastid and nuclear (ribosomal) phylogenies were compared and incongruences were detected as potential instances of allopolyploid speciation. Five strongly supported incongruences were detected in Fragariinae and four of them were considered to be potentially caused by allopolyploidy. In addition, five supported incongruences were found in Potentilla. Alchemilla in the wide sense was found to contain four major clades, African Alchemilla, Eurasian Alchemilla, Lachemilla and Aphanes. Both Lachemilla and Aphanes were nested within Alchemilla and it was suggested that the name Alchemilla should be used in the wide sense, i.e. including both the genera Lachemilla and Aphanes. The genus Sibbaldia as commonly classified was shown to be polyphyletic in five different places in Potentilleae. Three Sibbaldia clades ended up in Fragariinae and two in Potentilla. A phylogeny of Fragaria, based on a nuclear low/single copy DNA region was estimated. The gene copy phylogeny was used to construct a reticulate tree hypothesizing allopolyploid speciation events. The evolution of Fragaria was shown to have been shaped by polyploidy.

sted, utgiver, år, opplag, sider
Stockholm: Department of Botany, Stockholm University, 2011. s. 28
Emneord
Potentilleae, Fragariinae, Potentilla, Sibbaldia, Fragaria, Alchemilla, systematics, phylogeny, polyploidy, autopolyploidy, allopolyploidy, reticulate evolution
HSV kategori
Forskningsprogram
växtsystematik
Identifikatorer
urn:nbn:se:su:diva-53967 (URN)978-91-7447-227-1 (ISBN)
Disputas
2011-05-20, föreläsningssalen, Botanicum, Lilla Frescativägen 5, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 4: Manuscript. Paper 5: Manuscript.Tilgjengelig fra: 2011-04-28 Laget: 2011-01-25 Sist oppdatert: 2011-04-26bibliografisk kontrollert

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