ORBi: Verheggen François - Involvement of odorant cues in the process of superparasitism avoidance

Reference : Involvement of odorant cues in the process of superparasitism avoidance


	Document type :	Scientific congresses and symposiums : Poster
	Discipline(s) :	Life sciences : Environmental sciences & ecology Life sciences : Entomology & pest control
	To cite this reference:	http://hdl.handle.net/2268/68468

Title :	Involvement of odorant cues in the process of superparasitism avoidance
Language :	English
Author, co-author :	Verheggen, François [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
	Vandermoten, Sophie [Université de Liège - ULg > Sciences agronomiques > Entomologie fonctionnelle et évolutive >]
	Frere, Isabelle [ > > ]
	Genin, Véronique [ > > ]
	Haubruge, Eric [Université de Liège - ULg > Services administratifs généraux > Vice-Recteur de Gembloux Agro Bio Tech - Entomologie fonctionnelle et évolutive >]
	Hance, Thierry [ > > ]
Publication date :	Aug-2010
On invitation :	No
Audience :	International
Event name :	26th International Sociey of Chemical Ecology Annual Meeting
Event date :	du 31 juillet au 4 août 2010
Event organizer :	International Sociey of Chemical Ecology
Event place (city) :	Tours
Event country :	France
Keywords :	[en] Chemical Ecology ; Aphids ; pheromone ; natural enemies ; Parasitoids ; electronic nose ; semiochemicals
Abstract :	[en] The ability to avoid superparasitism provides a selective advantage to parasitoid females, allowing them to avoid depositing eggs in lower quality host. We observed in a Y-olfactometer that generalist aphid parasitoids, Aphidius ervi and Aphidius rhopalosiphi (Hymenoptera, Braconidae), were more attracted toward non-parasitized than parasitized Sitobion avenae (Hemiptera, Aphididae) colonies. We collected the odors released from healthy aphids and aphids parasitized for 2 and 6 days using an electronic nose. Sitobion avenae alarm pheromone, (E)-ß-farnesene (EßF), was the only chemical identified, and was found in lower quantities in parasitized aphids. Both parasitoid species provided pronounced electrical depolarizations to EßF in electroantennography (EAG), and both were attracted to the latter compound in the Y-olfactometer. Parasitoid attraction was known to be guided by a variety of odorant cues released by plants and hosts, and our results support the hypothesis that the aphid alarm pheromone acts as a kairomone for A. ervi and A. rhopalosiphi.
Funders :	Fonds de la Recherche Fondamentale Collective d'Initiative des Chercheurs - FRFC
Permalink :	http://hdl.handle.net/2268/68468

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