Fig. 5.

a Regression between the concentrations of extractable hydrogen peroxide (H₂O₂) and acyclic monoterpenes (geraniols), abundance of b Total abscisic acid (ABA) and c Total cytokinins (CKs) in wild rose petals. Regression fits in a for UB, MF, and SF are all significant (α = 0.05). Equality of means in (b, c) is tested using GLM ANOVA followed by Tukey’s test for ABA (α = 0.05), and Games–Howell test for CKs (α = 0.05). Each data box includes the mean, the median with lower and upper quartiles, and the whiskers cover the full data range. Significant differences do not share letter coding. ABA is quantified in all species. Names of species used for H₂O₂ (N = 14) and CKs (N = 9) analyses are given under methods