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A unique recent origin of the allotetraploid species Arabidopsis suecica: Evidence from nuclear DNA markers

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Author

  • Mattias Jakobsson
  • J Hagenblad
  • S Tavare
  • Torbjörn Säll
  • Christer Halldén
  • C Lind-Hallden
  • M Nordborg

Summary, in English

A coalescent-based method was used to investigate the origins of the allotetraploid Arabidopsis suecica, using 52 nuclear microsatellite loci typed in eight individuals of A. suecica and 14 individuals of its maternal parent Arabidopsis thaliana, and four short fragments of genomic DNA sequenced in a sample of four individuals of A. suecica and in both its parental species A. thaliana and Arabidopsis arenosa. All loci were variable in A. thaliana but only 24 of the 52 microsatellite loci and none of the four sequence fragments were variable in A. suecica. We explore a number of possible evolutionary scenarios for A. suecica and conclude that it is likely that A. suecica has a recent, unique origin between 12,000 and 300,000 years ago. The time estimates depend strongly on what is assumed about population growth and rates of mutation. When combined with what is known about the history of glaciations, our results suggest that A. suecica originated south of its present distribution in Sweden and Finland and then migrated north, perhaps in the wake of the retreating ice.

Department/s

Publishing year

2006

Language

English

Pages

1217-1231

Publication/Series

Molecular biology and evolution

Volume

23

Issue

6

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Medicinal Chemistry

Keywords

  • founders
  • speciation
  • polymorphism
  • polyploidy
  • Arabidopsis suecica
  • Arabidopsis thaliana

Status

Published

Research group

  • Clinical Chemistry, Malmö
  • Evolutionary Genetics

ISBN/ISSN/Other

  • ISSN: 0737-4038