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Dernière mise à jour : Mai 2018

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Institut Sophia Agrobiotech

UMR INRA - Univ. Nice Sophia Antipolis - Cnrs


03 August 2018

Time-course analysis of Drosophila suzukii interaction with endoparasitoid wasps evidences a delayed encapsulation response compared to D. melanogaster


Drosophila suzukii (the spotted-wing Drosophila) appears to be unsuitable for the development of most Drosophila larval endoparasitoids, be they sympatric or not. Here, we questioned the physiological bases of this widespread failure by characterizing the interactions between Dsuzukii and various parasitoid species (Asobara japonicaLeptopilina boulardiLeptopilina heterotoma and Leptopilina victoriae) and comparing them with those observed with Dmelanogaster, a rather appropriate host. All parasitoids were able to oviposit in L1 and L2 larval stages of both hosts but their propensity to parasitize was higher on DmelanogasterAjaponica and, to a much lesser extent, Lheterotoma, were the two species able to successfully develop in Dsuzukii, the failure of the parasitism resulting either in the parasitoid encapsulation (notably with Lheterotoma) or the host and parasitoid deaths (especially with Lboulardi and Lvictoriae). Compared to Dmelanogaster, encapsulation in Dsuzukii was strongly delayed and led, if successful, to the production of much larger capsules in surviving flies and, in the event of failure, to the death of both partners because of an uncontrolled melanization. The results thus revealed a different timing of the immune response to parasitoids in Dsuzukii compared to Dmelanogaster with a lose-lose outcome for parasitoids (generally unsuccessful development) and hosts (high mortality and possible reduction of the fitness of survivors). Finally, these results might suggest that some European endoparasitoids of Drosophila interact with this pest in the field in an unmeasurable way, since they kill their host without reproductive success.


Drosophila, Larvae, Drosophila melanogaster, Wasps, Parasitism, Parasite physiology, Immune response, Host-pathogen interactions

Iacovone, A., Ris, N., Poirié, M., and Gatti, J.-L. (2018). Time-course analysis of Drosophila suzukii interaction with endoparasitoid wasps evidences a delayed encapsulation response compared to D. melanogaster. PLOS ONE 13, e0201573. DOI: 10.1371/journal.pone.0201573

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