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On the post-glacial spread of human commensal Arabidopsis thaliana
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Journal Article
On the post-glacial spread of human commensal Arabidopsis thaliana
2017
Overview
Recent work has shown that
Arabidopsis thaliana
contains genetic groups originating from different ice age refugia, with one particular group comprising over 95% of the current worldwide population. In Europe, relicts of other groups can be found in local populations along the Mediterranean Sea. Here we provide evidence that these ‘relicts’ occupied post-glacial Eurasia first and were later replaced by the invading ‘non-relicts’, which expanded through the east–west axis of Eurasia, leaving traces of admixture in the north and south of the species range. The non-relict expansion was likely associated with human activity and led to a demographic replacement similar to what occurred in humans. Introgressed genomic regions from relicts are associated with flowering time and enriched for genes associated with environmental conditions, such as root cap development or metal ion trans-membrane transport, which suggest that admixture with locally adapted relicts helped the non-relicts colonize new habitats.
Population structure of the model plant
Arabidopsis thaliana
is shaped by glacial refugia and recent admixture. Here the authors show that genetically distinct groups of
A. thaliana
have spread east-west across Europe since the most recent ice age, likely as a result of human activity.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
