Abdominal sensory equipment involved in external host discrimination in a solitary parasitoid wasp.

Abstract : Already parasitized hosts are often of poorer quality than healthy hosts. It is therefore usually advantageous for parasitoid females to recognize and reject them. Parasitized hosts can be identified on the basis of various physical or chemical marks present on the surface or inside the hosts or their surroundings in the case of concealed host. Here we studied host discrimination behaviors of females of a certain population of Pachycrepoideus vindemmiae, a solitary ectoparasitoid, which are known to reject large-sized parasitized hosts after an abdominal examination of their surface. We first investigated females' recognition behaviors of host parasitism status when confronted to small-sized hosts (Drosophila melanogaster pupae) as host size may influence the use of different cues for host selection. We showed that, in such a situation, females also discriminate parasitized hosts after an external host exploration with the tip of their ovipositor sheath (third valvulae). We then described the sense organs present on the different parts of the ovipositor by means of scanning and transmission electron microscopy analysis. As the extremity of the third valvulae bears only one type of sensilla that appears to be chemoreceptors, we considered these sensilla as highly likely to be involved in host discrimination in P. vindemmiae. To our knowledge, this is the first time that receptors located on the ovipositor sheath are described as implicated in host discrimination in parasitoid wasps. We discuss potential chemical markers that might be detected by these receptors.
Type de document :
Article dans une revue
Microscopy Research and Technique, Wiley, 2011, 74 (12), pp.1145-53. 〈10.1002/jemt.21007〉
Liste complète des métadonnées

https://hal-agrocampus-ouest.archives-ouvertes.fr/hal-00730145
Contributeur : Céline Martel <>
Soumis le : vendredi 7 septembre 2012 - 16:11:21
Dernière modification le : mercredi 16 mai 2018 - 11:23:28

Lien texte intégral

Identifiants

Citation

M. Goubault, A.M. Cortesero, C. Paty, J. Fourrier, S. Dourlot, et al.. Abdominal sensory equipment involved in external host discrimination in a solitary parasitoid wasp.. Microscopy Research and Technique, Wiley, 2011, 74 (12), pp.1145-53. 〈10.1002/jemt.21007〉. 〈hal-00730145〉

Partager

Métriques

Consultations de la notice

147