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Epicuticular factors involved in host recognition for the aphid parasitoid Aphidius rhopalosiphi.

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Muratori, Frédéric [UCL] Le Ralec, Anne Lognay, Georges Hance, Thierry [UCL]

In insect parasitoids, fitness is dependent on the host finding and recognition abilities of the female. Host recognition cues have been described for various host-parasitoid systems, but are still under investigation in aphid parasitoids. Our study aimed to clarify the respective role of physical and chemical cues in recognition of the aphid cuticle. Shed aphid exuviae were used as an elicitor in order to avoid any influence of color, movement, or volatiles present in a living aphid. We assessed the effect of chemical and heat treatments on the texture of the cuticle by using scanning electron microscopy and tested the recognition of treated cuticles by the parasitoid. We showed that recognition cues of the cuticle can be removed chemically (using combined treatments with n-hexane and methanol). Moreover, heat treatment destroyed the physical texture of the cuticle without significantly reducing parasitoid recognition. In a second step, we showed that epicuticular extracts deposited on pieces of paper triggered female attack behavior. First results concerning the chemical composition of the active extract are presented. This study shows that chemical compounds extractable by organic solvents mediate cuticle recognition by aphid parasitoids.

Document type Article de périodique (Journal article) – Journal Article, Research Support, Non-U.S. Gov't
Access type Accès restreint
Publication date 2006
Journal information "Journal of chemical ecology" - Vol. 32, no. 3, p. 579-93 (2006)
Peer reviewed yes
issn 0098-0331
Publication status Publié
Affiliations UCL - SC/BIOL - Département de biologie
UCL - SST/ELI/ELIB - Biodiversity
MESH Subject Animals ; Aphids - anatomy & histology - metabolism - parasitology ; Behavior, Animal - physiology ; Complex Mixtures - chemistry ; Female ; Heat ; Host-Parasite Interactions ; Solvents - chemistry ; Wing - ultrastructure
Links
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Bibliographic reference Muratori, Frédéric ; Le Ralec, Anne ; Lognay, Georges ; Hance, Thierry. Epicuticular factors involved in host recognition for the aphid parasitoid Aphidius rhopalosiphi.. In: Journal of chemical ecology, Vol. 32, no. 3, p. 579-93 (2006)
Permanent URL http://hdl.handle.net/2078.1/10548