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New insights into polyploid evolution in Fragaria (Rosaceae) based on the single/low copy nuclear intergenic region RGA1-Subtilase
Stockholm University, Faculty of Science, Department of Botany.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

A phylogenetic study of the genus Fragaria (Rosaceae) was performed based on the nuclear low/singlecopy intergenic region between the two genes Resistance Gene Analogue 1 (RGA1) and Subtilase(Subt). Potential diploid progenitors of the polyploid Fragaria species were detected and autopolyploid species were distinguished from allopolyploid. Our analyses indicate nine separate events of polyploidization in the evolution of Fragaria, of which three are of autopolyploid and six are of allopolyploid origin. Three tetraploid Fragaria have a probable autopolyploid origin, while a fourth one is most likely an allopolyploid. Fragaria nipponica is the diploid progenitor of autotetraploid F. tibetica, a diploid of the F. nipponica lineage is the progenitor of autotetraploid F. gracilis and F. vesca or more likely F. mandshurica is the diploid progenitor of autotetraploid F. orientalis. The progenitorsof the allotetraploid F. corymbosa are a diploid of the F. nipponica lineage and a diploid sister to the F.nipponica lineage. The hexaploid F. moschata originated after two events of allopolyploidization. First,a hybridization event involving the two diploids F. vesca and F. viridis took place, resulting in an undescribed allotetraploid and secondly, this allotetraploid hybridized with a diploid of the F. iinumae lineage. The octoploid lineage that gave rise to the two species F. virginiana and F. chiloensis was formed after an allopolyploidization event between F. moschata and a diploid of the F. iinumae lineage.The decaploid F. iturupensis originated after an allopolyploidization event between the octoploid lineage and a diploid of the F. iinumae lineage. The potential new species, formerly known as F.virginiana ssp. platypetala, originated after an allopolyploidization event between F. virginiana and a diploid Fragaria basally placed in our phylogeny, close to F. daltoniana.

Keyword [en]
Fragaria, polyploid speciation, allopolyploidy, autopolyploidy, single/low copy gene, phylogenetics, reticulate evolution
National Category
Biological Systematics
Research subject
Systematic Botany
Identifiers
URN: urn:nbn:se:su:diva-56685OAI: oai:DiVA.org:su-56685DiVA: diva2:412168
Available from: 2011-04-26 Created: 2011-04-20 Last updated: 2011-04-26Bibliographically approved
In thesis
1. Systematics and polyploid evolution in Potentilleae (Rosaceae)
Open this publication in new window or tab >>Systematics and polyploid evolution in Potentilleae (Rosaceae)
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Stockholm: Department of Botany, Stockholm University, 2011. 28 p.
Keyword
Potentilleae, Fragariinae, Potentilla, Sibbaldia, Fragaria, Alchemilla, systematics, phylogeny, polyploidy, autopolyploidy, allopolyploidy, reticulate evolution
National Category
Biological Systematics
Research subject
Plant Systematics
Identifiers
urn:nbn:se:su:diva-53967 (URN)978-91-7447-227-1 (ISBN)
Public defence
2011-05-20, föreläsningssalen, Botanicum, Lilla Frescativägen 5, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
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.Available from: 2011-04-28 Created: 2011-01-25 Last updated: 2011-04-26Bibliographically approved

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