Fig. 12

The effect of cultivation systems: rhizotron (black), container (grey), and transplanted (hatched) on ACC (A), ABA (B), and SA (C) concentration in the meristematic zone of short, medium, and long taproots of Q. robur seedlings. Each point represents the mean hormone values for each root length class in each cultivation system. The hormone concentration values were log10-transformed before statistical analysis, but figures present non-transformed data. The significance of variation between cultivation systems within length classes (short, medium, and long) results from an analysis of variance (ANOVA) and is given for each length class panel. Different lowercase letters indicate significantly different means among different cultivation systems within a given length class at α = 0.05 according to Tukey's test. Error bars represent the standard error