Table 4. The association between the first three principal
components extracted from principal component analysis of climatic
variables and mean germination proportions of populations ofArabidopsis thaliana sampled in Fennoscandia and Italy examined
with multiple regression. Germination proportion was recorded among
seeds that had been stored dry for 1, 3 and 12 weeks after seed
maturation in the greenhouse, and for 12 weeks after seed collection at
an Italian and a Swedish field site. Statistically significant effects
(P<0.05) are in bold.