Evolution of microsatellites in Arabis petraea and Arabis lyrata, outcrossing relatives of Arabidopsis thaliana |
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Authors: | van Treuren R; Kuittinen H; Karkkainen K; Baena-Gonzalez E; Savolainen O |
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Institution: | Department of Biology, University of Oulu, Finland. |
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Abstract: | We examined microsatellite variation in two diploid, outcrossing relatives
of Arabidopsis thaliana, Arabis petraea and Arabis lyrata. The primer
sequences were derived from A. thaliana. About 50% (14 loci) of the A.
thaliana primers could successfully amplify microsatellites in the related
species. Analysis of microsatellite structure in the related species showed
that there had been large changes in the microsatellites: there were large
differences in repeat numbers and many of the A. thaliana simple repeats
were shorter in the related species. For the loci we compared, the related
species had a much lower level of variability at the microsatellites than
Japanese wild populations of A. thaliana. This is presumably related to the
different microsatellite structures, because allozyme data showed that the
outcrossing relatives were highly polymorphic compared to other outcrossing
herbaceous species. Use of microsatellites in assessing variability or
phylogenetic relationships between different species requires caution,
because changes in microsatellite structure may alter evolutionary rates.
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