Volatile communication in plants relies on a KAI2-mediated signaling pathway
Résumé
Plants are constantly exposed to volatile organic compounds (VOCs) released during plant-plant communication, within-plant self-signaling and plant-microbe interactions. Therefore, understanding VOC perception and downstream signaling is vital for unraveling the mechanisms behind information exchange in plants, which remain largely unexplored. Using the hormone-like function of volatile terpenoids in reproductive organ development as a system with a visual marker for communication, we demonstrated that a petunia karrikin-insensitive receptor, PhKAI2ia, stereo-specifically perceives the (-)-germacrene D signal, triggering a KAI2mediated signaling cascade and affecting plant fitness. This study uncovers the role(s) of the intermediate clade of KAI2 receptors, illuminates the involvement of a KAI2ia-dependent signaling pathway in volatile communication and provides new insights into plant olfaction and the long-standing question about the nature of potential endogenous KAI2 ligand(s).
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