Figure 5: Indole exposure restores within-plant priming in igl-mutants.

Maize seedlings were exposed to control or volatile indole dispensers for 12 h. They were then elicited by wounding and application of S. littoralis regurgitant and placed into clean vessels. HIPVs were collected for 600 min. The graphs show the total emissions of four major families of HIPVs for control- and indole-exposed plants at different times after elicitation: green leaf volatiles, monoterpenes, homoterpenes and sesquiterpenes. Asterisks indicate statistical differences between control- and indole-exposed plants (Holm-Sidak post hoc tests, *P<0.05, **P<0.01, ***P<0.001, n=4–5). F-values (F), P-values (P) and residual degrees of freedom (df) are shown for ANOVAs comparing total emissions between treatments and genotypes. Error bars correspond to standard errors (±s.e.). For individual compounds, see Supplementary Figs 7 and 8.