Table 2. Mean (±1 SE) RDPI values for weekly growth-in-height, stomatal conductance, water use efficiency and chlorophyll content of four V. alpina populations after eight-week cultivation in a growth chamber. The F values and the associated p values (d.o.f. = 3,36) obtained by one-way ANOVAs are shown for all variables. Within each column, the means followed by the same letter do not differ from each other at p < 0.05 based on Fisher’s LSD tests.