Fig. 4.

Contents of total monoterpenes in tissues of (a, c) Pinus sylvestris and (b, d) Picea abies seedlings, both basal (a, b) and apical (c, d), expressed in absolute amounts of pentadecane equivalents (μg g⁻¹ d.w.) + SE. The asterisks between bars indicate significant differences according to t-tests at P < 0.05 (N = 16)