Differentiation in native as well as introduced ranges: germination reflects mean and variance in cover of surrounding vegetation

AoB Plants
Tina HegerBrooke S Jacobs

Abstract

Germination, a crucial phase in the life cycle of a plant, can be significantly influenced by competition and facilitation. The aim of this study was to test whether differences in cover of surrounding vegetation can lead to population differentiation in germination behaviour of an annual grassland species, and if so, whether such a differentiation can be found in the native as well as in the introduced range. We used maternal progeny ofErodium cicutariumpreviously propagated under uniform conditions that had been collected in multiple populations in the native and two introduced ranges, in populations representing extremes in terms of mean and variability of the cover of surrounding vegetation. In the first experiment, we tested the effect of germination temperature and mean cover at the source site on germination, and found interlinked effects of these factors. In seeds from one of the introduced ranges (California), we found indication for a 2-fold dormancy, hindering germination at high temperatures even if physical dormancy was broken and water was available. This behaviour was less strong in high cover populations, indicating cross-generational facilitating effects of dense vegetation. In the second experiment, we tested ...Continue Reading

References

Apr 25, 2009·Plant, Cell & Environment·Ariel Novoplansky
Jan 29, 2011·The Journal of Experimental Biology·Dennis EvangelistaJacques Dumais
Mar 18, 2011·Proceedings. Biological Sciences·Andrew M Simons
May 31, 2011·American Journal of Botany·John L Orrock, Cory C Christopher

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