Figure 6

Principle component analysis (PCA) of non-target metabolomics. Metabolic differences between T- (red) and S-oaks (blue) from damaged (Td and Sd) and intact (Ti and Si) leaves. All plants were fed by T.viridana for 32 h and the leaves were 'old’ (6–8 weeks after budbreak) (PCA1 = 8% and PCA2 = 7% of total X-variable variation).