The scale of population structure in Arabidopsis thaliana

Alexander Platt, Matthew Horton, Yu S. Huang, Yan Li, Alison E. Anastasio, Ni Wayan Mulyati, Jon Ågren, Oliver Bossdorf, Diane Byers, Kathleen Donohue, Megan Dunning, Eric B. Holub, Andrew Hudson, Valérie Le Corre, Olivier Loudet, Fabrice Roux, Norman Warthmann, Detlef Weigel, Luz Rivero, Randy SchollMagnus Nordborg, Joy Bergelson, Justin O. Borevitz

Research output: Contribution to journalArticlepeer-review


The population structure of an organism reflects its evolutionary history and influences its evolutionary trajectory. It constrains the combination of genetic diversity and reveals patterns of past gene flow. Understanding it is a prerequisite for detecting genomic regions under selection, predicting the effect of population disturbances, or modeling gene flow. This paper examines the detailed global population structure of Arabidopsis thaliana. Using a set of 5,707 plants collected from around the globe and genotyped at 149 SNPs, we show that while A. thaliana as a species self-fertilizes 97% of the time, there is considerable variation among local groups. This level of outcrossing greatly limits observed heterozygosity but is sufficient to generate considerable local haplotypic diversity. We also find that in its native Eurasian range A. thaliana exhibits continuous isolation by distance at every geographic scale without natural breaks corresponding to classical notions of populations. By contrast, in North America, where it exists as an exotic species, A. thaliana exhibits little or no population structure at a continental scale but local isolation by distance that extends hundreds of km. This suggests a pattern for the development of isolation by distance that can establish itself shortly after an organism fills a new habitat range. It also raises questions about the general applicability of many standard population genetics models. Any model based on discrete clusters of interchangeable individuals will be an uneasy fit to organisms like A. thaliana which exhibit continuous isolation by distance on many scales.

Original languageEnglish (US)
Article numbere1000843
JournalPLoS genetics
Issue number2
StatePublished - Feb 2010

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Biology
  • Genetics
  • Genetics(clinical)
  • Cancer Research


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