Heteromorphic seeds can show differences in dormancy and germination, but it is not known how this affects maintenance and regeneration of populations. Cao et al. bury different seed morphs of an annual halophyte, Suaeda corniculata, and examine germination dynamics at monthly intervals over 2 years. They find that black seeds have an annual dormancy/non-dormancy cycle that is absent in brown seeds, and they also exhibit an annual cycle in sensitivity of germination to salinity. Brown seeds form only a transient soil seed bank whilst black seeds form a persistent one. They conclude that differences in performance of the two seed morphs in the soil seed bank increase fitness of the species in unpredictable saline environments.
About the author
Annals of Botany Office
The Annals of Botany Office is based at the University of Oxford.
Launching ‘Botany Live’: a global online event to celebrate ‘Fascination of Plants Day 2017’762 Total Shares