Interaction between the parasitoid Cotesia typhae and its host Sesamia nonagrioides : insights into virulence and resistance traits - MNHN - Muséum national d'Histoire naturelle Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Interaction between the parasitoid Cotesia typhae and its host Sesamia nonagrioides : insights into virulence and resistance traits

Florence Mougel
Laure Marie-Paule Kaiser-Arnauld

Résumé

Cotesia typhae is a parasitoid Hymenoptera specialized on Sesamia nonagrioides, a lepidopteran stem borer. Both species originate from east Africa, but S. nonagrioides colonized the Mediterranean Basin during the last interglacial, more than hundred thousand years ago. There, S. nonagrioides has become a crop pest of maize. It is then considered to introduce C. typhae in France to regulate S. nonagrioides populations through biocontrol. In Kenya, two strains of C. typhae, named Kobodo and Makindu (after Kenyan locations sampled), differ in their parasitism success on the French S. nonagrioides population (SNF). While both strains score a good parasitism success on the Kenyan host population (SNK), that of Makindu is lower on SNF while that of Kobodo remains high. A QTL approach to investigate this difference of virulence between C. typhae strains had yielded 3 locus carrying hundreds of candidate genes, among which genes coding for venom proteins. To confirm their implication, we lead a comparative analysis on female proteomic venom content and abdomen transcriptomes, in order to identify candidate proteins and their related genes. In parallel, we investigated the difference of resistance between the S. nonagrioides populations with a comparative transcriptomic analysis of parasitized host larvae hemolymph RNA content, depending on their population origin, on C. typhae strain and on the time elapsed after oviposition. Temporal sampling of parasitized larvae was based on a histological study of capsule formation. Together, these analyzes will allow us to refine candidate genes involved in this virulence/resistance interaction between the parasitoid and its host.
Fichier principal
Vignette du fichier
Oral_presentation_Gornard_ECE.pdf (1.9 Mo) Télécharger le fichier
Fichier sous embargo
Origine Fichiers produits par l'(les) auteur(s)
Fichier sous embargo
1 9 16
Année Mois Jours
Avant la publication
mercredi 13 mai 2026

Dates et versions

mnhn-04571101 , version 1 (07-05-2024)

Identifiants

  • HAL Id : mnhn-04571101 , version 1

Citer

Samuel Gornard, Florence Mougel, Laure Marie-Paule Kaiser-Arnauld. Interaction between the parasitoid Cotesia typhae and its host Sesamia nonagrioides : insights into virulence and resistance traits: PhD works, supervised by Florence Mougel-Imbert and Laure Kaiser-Arnauld In collaboration with Claire Capdevielle-Dulac, Pascaline Venon and Florian Lasfont. XII European Congress of Entomology, Hellenic Entomological Society,, Oct 2023, Héraklion (Crete), Greece. ⟨mnhn-04571101⟩
10 Consultations
0 Téléchargements

Partager

Gmail Mastodon Facebook X LinkedIn More