Figure 1. Map indicating locations of the study populations in
Fennoscandia (blue symbols) and Italy (red symbols), and of the two field common gardens (triangles), one in Sweden (Rödåsen) and one in Italy
(Castelnuovo di Porto).
Figure 2. Climate at the site of origin of the natural
populations of Arabidopsis thaliana sampled in Italy (in red) and
Fennoscandia (in blue). (A) Mean monthly temperature (˚C), and (B) Mean
monthly precipitation (mm). Data retrieved from the WorldClim database
(Fick and Hijmans 2017).
Figure 3. Mean germination proportion (number of seeds
germinating per viable seed sown) of natural populations of Arabidopsis thaliana sampled in Italy (in red) and Fennoscandia
(in blue) (A) 12 weeks after seed harvest in three maternal
environments: greenhouse, the Italian field site (Castelnuovo di Porto),
and the Swedish field site (Rödåsen), and (B) 1, 3, 12, 30 and 54 weeks
after seed maturation in the greenhouse. Regional means are indicated in
bold.