Goelen, T, Sobhy, IS ORCID: https://orcid.org/0000-0003-4984-1823, Vanderaa, C, de Boer, JG, Delvigne, F, Francis, F, Wackers, F, Rediers, H, Verstrepen, KJ, Wenseleers, T, Jacquemyn, H and Lievens, B (2019) Volatiles of bacteria associated with parasitoid habitats elicit distinct olfactory responses in an aphid parasitoid and its hyperparasitoid. Functional Ecology.

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Abstract

To locate mating partners and essential resources such as food, oviposition sites and shelter, insects rely to a large extent on chemical cues. While most research has focused on cues derived from plants and insects, there is mounting evidence that indicates that micro‐organisms emit volatile compounds that may play an important role in insect behaviour.
In this study, we assessed how volatile compounds emitted by phylogenetically diverse bacteria affected the olfactory response of the primary parasitoid Aphidius colemani and one of its secondary parasitoids, Dendrocerus aphidum . Olfactory responses were evaluated for volatile blends emitted by bacteria isolated from diverse sources from the parasitoid's habitat, including aphids, aphid mummies and honeydew, and from the parasitoids themselves.
Results revealed that A. colemani showed a wide variation in response to bacterial volatiles, ranging from significant attraction over no response to significant repellence. Our results further showed that the olfactory response of A. colemani to bacterial volatile emissions was different from that of D. aphidum . Gas chromatography‐mass spectrometry analysis of the volatile blends revealed that bacterial strains repellent to A. colemani produced significantly higher amounts of esters, organic acids, aromatics and cycloalkanes than attractive strains. Strains repellent to D. aphidum produced significantly higher amounts of alcohols and ketones, whereas the strains attractive to D. aphidum produced higher amounts of the monoterpenes limonene, linalool and geraniol.
Overall, our results indicate that bacterial volatiles can have an important impact on insect olfactory responses, and should therefore be considered as an additional, so far often overlooked factor in studying multitrophic interactions between plants and insects.

Item Type: Article
Additional Information: The final version of this article and all relevant information related to it can be found at; https://besjournals.onlinelibrary.wiley.com/doi/abs/10.1111/1365-2435.13503
Uncontrolled Keywords: Aphidius colemani; chemical communication; Dendrocerus aphidum; microbial odour; multitrophic interactions; natural enemy; semiochemical; VOCs
Subjects: Q Science > Q Science (General)
R Medicine > R Medicine (General)
R Medicine > R Medicine (General) > R735 Medical education. Medical schools. Research
Related URLs:
Depositing User: Symplectic
Date Deposited: 05 Aug 2020 14:34
Last Modified: 05 Aug 2020 14:34
URI: https://eprints.keele.ac.uk/id/eprint/8474

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