Fig. 4
From: Poplar protease inhibitor expression differs in an herbivore specific manner
Transcript accumulation of Kunitz-type trypsin inhibitor genes (KTIs) of the a, b, and d subfamily in black poplar leaves after herbivory by two caterpillar species (L. dispar, A. mogadorensis) and one beetle species (P. vulgatissima). Shown are the gene expression normalized to Actin and relative to a control sample as boxplots (median with upper and lower quartile as bars; n = 6); results of the ANOVA are given in each graph. Different letters indicate significant differences among groups (P < 0.05; Tukey’s post-hoc test)