Volatiles of bacteria associated with parasitoid habitats elicit distinct olfactory responses in an aphid parasitoid and its hyperparasitoid

Tim Goelen, Islam S. Sobhy, Christophe Vanderaa, Jetske G. de Boer, Frank Delvigne, Frédéric Francis, Felix Wäckers, Hans Rediers, Kevin J. Verstrepen, Tom Wenseleers, Hans Jacquemyn, Bart Lievens (Corresponding author)

Research output: Contribution to journal/periodicalArticleScientificpeer-review

Abstract

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. A free Plain Language Summary can be found within the Supporting Information of this article.
Original languageEnglish
Pages (from-to)507-520
JournalFunctional Ecology
Volume34
Issue number2
Early online date04 Dec 2019
DOIs
Publication statusPublished - 2020

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Bibliographical note

6913, TE; Data Archiving: Data archived at Dryad, no NIOO project

Keywords

  • international
  • chemical communication
  • Dendrocerus aphidum
  • microbial odour
  • multitrophic interactions
  • natural enemy
  • semiochemical
  • VOCs
  • Aphidius colemani
  • Plan_S-Compliant_NO

Cite this

Goelen, T., Sobhy, I. S., Vanderaa, C., de Boer, J. G., Delvigne, F., Francis, F., Wäckers, F., Rediers, H., Verstrepen, K. J., Wenseleers, T., Jacquemyn, H., & Lievens, B. (2020). Volatiles of bacteria associated with parasitoid habitats elicit distinct olfactory responses in an aphid parasitoid and its hyperparasitoid. Functional Ecology, 34(2), 507-520. https://doi.org/10.1111/1365-2435.13503