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Clinal variation in allele frequency and gene expression at photoperiodic and circadian genes in Siberian spruce: an example of parallel evolution?
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Plant Ecology and Evolution.
CNR, Plant Genetics Institute, Sesto Fiorentino, Firenze, Italy.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Plant Ecology and Evolution.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Plant Ecology and Evolution.
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(English)Manuscript (preprint) (Other academic)
National Category
Evolutionary Biology Genetics
Research subject
Biology with specialization in Evolutionary Functional Genomics; Biology with specialization in Evolutionary Genetics
Identifiers
URN: urn:nbn:se:uu:diva-177529OAI: oai:DiVA.org:uu-177529DiVA: diva2:541117
Available from: 2012-07-13 Created: 2012-07-13 Last updated: 2014-01-23
In thesis
1. Neutral and Adaptive Processes Shaping Genetic Variation in Spruce Species
Open this publication in new window or tab >>Neutral and Adaptive Processes Shaping Genetic Variation in Spruce Species
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Population genetic analyses can provide information about both neutral and selective evolutionary processes shaping genetic variation. In this thesis, extensive population genetic methods were used to make inferences about genetic drift and selection in spruce species. In paper I we studied four species from the Qinghai-Tibetan Plateau (QTP): Picea likiangensis, P. purpurea, P. wilsonii and P. schrenkiana. Big differences in estimates of genetic diversity and Ne were observed in the more restricted species, P. schrenkiana, and the other more widely distributed species. Furthermore, P. purpurea appears to be a hybrid between P. likiangensis and P. wilsonii. In paper II we used Approximate Bayesian Computation (ABC) to find that the data support a drastic reduction of Ne in Taiwan spruce around 300-500 kya, in line with evidence from the pollen records. The split from P. wilsonii was dated to between 4-8 mya, around the time that Taiwan was formed. These analyses relied on a small sample size, and so in Paper III we investigated the impact of small datasets on the power to distinguish between models in ABC. We found that when genetic diversity is low there is little power to distinguish between simple coalescent models and this can determine the number of samples and loci required.

In paper IV we studied the relative importance of genetic drift and selection in four spruce species with differing Ne: P. abies, P. glauca, P. jezoensis and P. breweriana. P. breweriana, which has a low Ne, exhibits a low fraction of adaptive substitutions, while P. abies has high Ne and a high fraction of adaptive substitutions. The other two spruce, however, do not support this suggesting other factors a more important. In paper V we find that several SNPs correlate with both a key adaptive trait (budset) and latitude. The expression of one in particular (PoFTL2) correlates with budset and was previously indentified in P. abies. These studies have helped characterise the importance of different population genetic processes in shaping genetic variation in spruce species and has laid some solid groundwork for future studies of spruce.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2013. 30 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1078
Keyword
spruce, population genetics, adaptation, evolution, picea, approximate bayesian computation, cline
National Category
Evolutionary Biology
Identifiers
urn:nbn:se:uu:diva-207714 (URN)978-91-554-8760-7 (ISBN)
Public defence
2013-10-31, Lindahlsalen, Evolutionary Biology Centre, Uppsala, 09:30 (English)
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Supervisors
Available from: 2013-10-10 Created: 2013-09-18 Last updated: 2014-01-23

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