Seed dispersal in time can counteract the effect of gene flow between natural populations of Arabidopsis thaliana
Article first published online: 28 JAN 2014
© 2014 The Authors. New Phytologist © 2014 New Phytologist Trust
Volume 202, Issue 3, pages 1043–1054, May 2014
How to Cite
Falahati-Anbaran, M., Lundemo, S. and Stenøien, H. K. (2014), Seed dispersal in time can counteract the effect of gene flow between natural populations of Arabidopsis thaliana. New Phytologist, 202: 1043–1054. doi: 10.1111/nph.12702
- Issue published online: 10 APR 2014
- Article first published online: 28 JAN 2014
- Manuscript Accepted: 19 DEC 2013
- Manuscript Received: 27 OCT 2013
- the Norwegian Research Council. Grant Number: 10298100
- genetic drift;
- seed bank;
- seed dispersal
- Plants may escape unfavorable environments by dispersing to new sites, or by remaining in an ungerminated state at a given site until environmental conditions become favorable. There is limited evidence regarding the occurrence, interplay and relative importance of dispersal processes in time and space in plant populations.
- Thirty-six natural populations of the annual ruderal species Arabidopsis thaliana were monitored over five consecutive years, sampling both seed bank and above-ground cohorts.
- We show that immigration rates are considerably higher than previously inferred, averaging 1.7% per population yr–1. On the other hand, almost one-third of the individuals in a given above-ground cohort result from seeds shed 2 or 3 yr back in time in 10 of the studied populations. Populations that disappeared one year were recolonized by regeneration from the seed bank the subsequent year.
- Thus, dispersal in both time and space is an important contributor to the structuring of genetic variability in natural populations of A. thaliana, where a high dispersal rate in time may partly counteract the homogenizing effects of spatial seed and pollen dispersal.