Seed dormancy varies widely among Arabidopsis thaliana populations both between and within Fennoscandia and Italy.

Autor: Zacchello G; Plant Ecology and Evolution Department of Ecology and Genetics EBC Uppsala University Uppsala Sweden., Bomers S; Plant Ecology and Evolution Department of Ecology and Genetics EBC Uppsala University Uppsala Sweden.; Institute for Seed and Propagating Material, Phytosanitary Service and Apiculture Austrian Agency for Health and Food Safety Vienna Austria., Böhme C; Plant Ecology and Evolution Department of Ecology and Genetics EBC Uppsala University Uppsala Sweden., Postma FM; Plant Ecology and Evolution Department of Ecology and Genetics EBC Uppsala University Uppsala Sweden., Ågren J; Plant Ecology and Evolution Department of Ecology and Genetics EBC Uppsala University Uppsala Sweden.
Jazyk: angličtina
Zdroj: Ecology and evolution [Ecol Evol] 2022 Mar 01; Vol. 12 (3), pp. e8670. Date of Electronic Publication: 2022 Mar 01 (Print Publication: 2022).
DOI: 10.1002/ece3.8670
Abstrakt: The timing of germination is a key life-history trait in plants, which is strongly affected by the strength of seed dormancy. Continental-wide genetic variation in seed dormancy has been related to differences in climate and the timing of conditions suitable for seedling establishment. However, for predictions of adaptive potential and consequences of climatic change, information is needed regarding the extent to which seed dormancy varies within climatic regions and the factors driving such variation. We quantified dormancy of seeds produced by 17 Italian and 28 Fennoscandian populations of Arabidopsis thaliana when grown in the greenhouse and at two field sites in Italy and Sweden. To identify possible drivers of among-population variation in seed dormancy, we examined the relationship between seed dormancy and climate at the site of population origin, and between seed dormancy and flowering time. Seed dormancy was on average stronger in the Italian compared to the Fennoscandian populations, but also varied widely within both regions. Estimates of seed dormancy in the three maternal environments were positively correlated. Among Fennoscandian populations, seed dormancy tended to increase with increasing summer temperature and decreasing precipitation at the site of population origin. In the smaller sample of Italian populations, no significant association was detected between mean seed dormancy and climate at the site of origin. The correlation between population mean seed dormancy and flowering time was weak and not statistically significant within regions. The correlation between seed dormancy and climatic factors in Fennoscandia suggests that at least some of the among-population variation is adaptive and that climate change will affect selection on this trait. The weak correlation between population mean seed dormancy and flowering time indicates that the two traits can evolve independently.
Competing Interests: The authors have no conflict of interest to declare.
(© 2022 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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