Indole is an essential herbivore-induced volatile priming signal in maize

摘要: Herbivore-induced volatile organic compounds prime non-attacked plant tissues to respond more strongly subsequent attacks. However, the key volatiles that trigger this primed state remain largely unidentified. In maize, release of aromatic compound indole is herbivore-specific and occurs earlier than other induced responses. We therefore hypothesized may be involved in airborne priming. Using indole-deficient mutants synthetic dispensers, we show herbivore-induced enhances induction defensive neighbouring maize plants a species-specific manner. Furthermore, essential for priming mono- homoterpenes systemic leaves attacked plants. Indole exposure markedly increases production stress hormones jasmonate-isoleucine conjugate abscisic acid, which represents likely mechanism indole-dependent These results demonstrate functions as rapid potent aerial agent prepares incoming