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The evolutionary history of the common chloroplast genome of Arabidopsis thaliana and A. suecica
Department of Cell and Organism Biology, Genetics, Lund University.
Department of Cell and Organism Biology, Genetics, Lund University.
Kristianstad University, Department of Mathematics and Science. (Biomedicin)
Department of Clinical Chemistry, Malmö University Hospital. (Biomedicin)ORCID iD: 0000-0002-9355-3901
2007 (English)In: Journal of Evolutionary Biology, ISSN 1010-061X, E-ISSN 1420-9101, Vol. 20, no 1, p. 104-121Article in journal (Refereed) Published
Abstract [en]

The evolutionary history of the common chloroplast (cp) genome of the allotetraploid Arabidopsis suecica and its maternal parent A. thaliana was investigated by sequencing 50 fragments of cpDNA, resulting in 98 polymorphic sites. The variation in the A. suecica sample was small, in contrast to that of the A. thaliana sample. The time to the most recent common ancestor (T(MRCA)) of the A. suecica cp genome alone was estimated to be about one 37th of the T(MRCA) of both the A. thaliana and A. suecica cp genomes. This corresponds to A. suecica having a MRCA between 10 000 and 50 000 years ago, suggesting that the entire species originated during, or before, this period of time, although the estimates are sensitive to assumptions made about population size and mutation rate. The data was also consistent with the hypothesis of A. suecica being of single origin. Isolation-by-distance and population structure in A. thaliana depended upon the geographical scale analysed; isolation-by-distance was found to be weak on the global scale but locally pronounced. Within the genealogical cp tree of A. thaliana, there were indications that the root of the A. suecica species is located among accessions of A. thaliana that come primarily from central Europe. Selective neutrality of the cp genome could not be rejected, despite the fact that it contains several completely linked protein-coding genes.

Place, publisher, year, edition, pages
2007. Vol. 20, no 1, p. 104-121
Keywords [en]
Arabidopsis suecica, Arabidopsis thaliana, chloroplast, DNA sequence polymorphism, evolutionary history, polyploidy, population structure, speciation
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:hkr:diva-8173DOI: 10.1111/j.1420-9101.2006.01217.xISI: 000242904600019PubMedID: 17210004OAI: oai:DiVA.org:hkr-8173DiVA, id: diva2:424472
Available from: 2011-06-17 Created: 2011-06-17 Last updated: 2019-07-03Bibliographically approved

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Lind-Halldén, ChristinaHalldén, Christer

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