Plant-to-plant communication mediating in-flight orientation of Aphidius ervi.

摘要: Broad bean plants (Vicia faba) infested by the pea aphid, Acyrthosiphon pisum, play a key role in in-flight orientation of parasitoid Aphidius ervi, producing host-induced synomones (HIS). These volatiles are herbivore-specific and systemically released from insect-free parts an plant, suggesting existence elicitor circulating throughout plant. This study was designed to investigate whether plant metabolic changes, leading HIS biosynthesis emission, can some way trigger similar responses neighboring through aerial and/or root communication. Uninfested broad maintained same pot together with A. pisum became more attractive towards ervi females when tested wind-tunnel bioassay. change not observed contact prevented among that had their close proximity, exudate roots may cause induction uninfested plants. grown hydroponically also produce aphid induced signals attract ervi. When intact (uninfested) placed hydroponic solution previously used grow aphid-infested it parasitoids, while did undergo such change. results indicate plant-to-plant signaling this tritrophic system occur at rhizosphere level is most likely mediated translocated elicitor.