Monoterpenes support systemic acquired resistance within and between plants ($)

Pathogen perception leads to local and systemic immune responses including systemic acquired resistance (SAR). The nature of the mobile signals and their movements remain uncertain. Riedlmeier et al. demonstrated that certain monoterpenes including α- and β-pinene accumulate in SAR-inducing conditions and enhance systemic resistance. Futher, they show evidence for “a tight association between plant-to-plant SAR-like signaling and monoterpene emissions.” Plant Cell