PAE9 effects on phytohormone content. Absolute quantification of phytohormones in uninfested plants and 4 and 8 h after M. persicae aphid infestation (*P < 0.05, **P < 0.01, ***P < 0.001, n = 6, linear mixed model with batch as random effect, values represent mean concentration, bars depict ses; ns, not significant).