Figure 3.

During Pathogen-Triggered SIS to Herbivory, ET Regulates Octadecanoid-Dependent, JA-Ile–Independent Defenses.

Lower Arabidopsis rosette leaves were inoculated with a sterile 10 mM MgSO₄ control solution (dark-gray bars) or Psm ES4326 cfa6 suspension (OD₆₀₀ = 0.2; light-gray bars). Four days later, the inoculated leaves were removed and newly hatched T. ni larvae were placed on the upper rosette leaves. Larval weight gain was measured after 7 d of feeding. For each experiment, weight gain data were normalized to the weight gain of larvae feeding on mock-inoculated wild-type (Col-0) plants. The bars represent the means (±se) of relative weight gain from two independent experiments with n = 36 larvae per treatment per experiment. Relative larval weight gain in wild-type (Col-0), ein2-1, aos, and ein2-1 aos plants (ANOVA; treatment, P < 0.05; genotype, P < 0.05; treatment × genotype, P < 0.05). Letters above the bars signify statistically significant differences among groups (Tukey, P < 0.05).