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Benoist R., Chantre C., Capdevielle Dulac Claire, Bodet M., Mougel F., Calatayud Paul-André, Dupas Stéphane, Huguet E., Jeannette Rémi, Obonyo J., Odorico C., Silvain Jean-François, Le Rü Bruno, Kaiser L. (2017). Relationship between oviposition, virulence gene expression and parasitism success in Cotesia typhae nov. sp. parasitoid strains. Genetica, 145 (6), 469-479. ISSN 0016-6707

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Lien direct chez l'éditeur doi:10.1007/s10709-017-9987-5

Titre
Relationship between oviposition, virulence gene expression and parasitism success in Cotesia typhae nov. sp. parasitoid strains
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000415691600002
AuteursBenoist R., Chantre C., Capdevielle Dulac Claire, Bodet M., Mougel F., Calatayud Paul-André, Dupas Stéphane, Huguet E., Jeannette Rémi, Obonyo J., Odorico C., Silvain Jean-François, Le Rü Bruno, Kaiser L.
SourceGenetica, 2017, 145 (6), p. 469-479. ISSN 0016-6707
RésuméStudying mechanisms that drive host adaptation in parasitoids is crucial for the efficient use of parasitoids in biocontrol programs. Cotesia typhae nov. sp. (Fernandez-Triana) (Hymenoptera: Braconidae) is a newly described parasitoid of the Mediterranean corn borer Sesamia nonagrioides (Lefebvre) (Lepidoptera: Noctuidae). Braconidae are known for their domesticated bracovirus, which is injected with eggs in the host larva to overcome its resistance. In this context, we compared reproductive success traits of four Kenyan strains of C. typhae on a French and a Kenyan populations of its host. Differences were found between the four strains and the two most contrasted ones were studied more thoroughly on the French host population. Parasitoid offspring size was correlated with parasitism success and the expression of bracovirus virulence genes (CrV1 and Cystatin) in the host larva after parasitism. Hybrids between these two parasitoid strains showed phenotype and gene expression profiles similar to the most successful parental strain, suggesting the involvement of dominant alleles in the reproductive traits. Ovary dissections revealed that the most successful strain injected more eggs in a single host larva than the less successful one, despite an equal initial ovocyte number in ovaries. It can be expected that the amount of viral particles increase with the number of eggs injected. The ability to bypass the resistance of the allopatric host may in consequence be related to the oviposition behaviour (eggs allocation). The influence of the number of injected eggs on parasitism success and on virulence gene expression was evaluated by oviposition interruption experiments.
Plan de classementSciences du monde végétal [076] ; Sciences du monde animal [080] ; Sciences fondamentales / Techniques d'analyse et de recherche [020]
Descr. géo.KENYA
LocalisationFonds IRD [F B010071395]
Identifiant IRDfdi:010071395
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010071395

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