Fig. 8
Concentration changes of phenolic needle metabolites. Shoot elongation and compound concentrations from 1 to 39 dpi in needles of control (filled symbols, mean ± SE, n = 3) and spore exposed spruce cuttings (open symbols, mean ± SE, n = 3). Triangles on day 39 indicate concentrations in healthy needles of treated cuttings (mean ± SE, n = 3). Concentration values are given as μmol g−1 dry weight. Significant differences between time points are marked with different letters, between the control and treated group with asterisks and between healthy and symptomized needles of infested cuttings on day 39 with a circle. Patterns of all individual compounds measured are shown in Additional file 11: Fig. S5