Figure 3. Mean (+ 1 SE) weekly growth of four V. alpinapopulations cultivated for eight weeks in a growth chamber at 16h light/ 8h dark photoperiod and temperature conditions simulating the average summer temperature at the southernmost warmest stand (PRA). The means followed by different letters significantly (p < 0.05) differed based on Fisher’s LSD tests following a one-way ANOVA. Significance of differences obtained by a two-way ANOVA (climate nested within geographic area) are summarized by asterisks (** = p< 0.01: * = p < 0.05).