Fig. 2.

Monoterpene contents of basal and apical tissues of a Pinus sylvestris and b Picea abies seedlings, expressed in absolute amounts of pentadecane equivalents (mg g⁻¹ d.w.) + SE. Different letters and the asterisk indicate significant differences according to the Tukey range test (at a 95 % confidence level, df = 56) and t-tests at P < 0.05 (N = 16), respectively