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

Guerrieri, E., Poppy, G.M., Powell, W., Rao, R. and Pennacchio, F. (2002) Plant-to-plant communication mediating in-flight orientation of Aphidius ervi Journal of Chemical Ecology, 28, (9), pp. 1703-1715. (doi:10.1023/A:1020553531658).

Record type: Article


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

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Published date: September 2002
Keywords: synomones, phytopheromones, wind tunnel, flight behavior, aphidiinae, aphididae


Local EPrints ID: 56320
ISSN: 0098-0331
PURE UUID: 31f7a9a7-78c4-4bf0-92cd-d63b9652f583

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Date deposited: 08 Aug 2008
Last modified: 17 Jul 2017 14:31

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Author: E. Guerrieri
Author: G.M. Poppy
Author: W. Powell
Author: R. Rao
Author: F. Pennacchio

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