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Benoist R., Paquet S., Decourcelle F., Guez J., Jeannette Rémi, Calatayud Paul-André, Le Rü Bruno, Mougel F., Kaiser L. (2020). Role of egg-laying behavior, virulence and local adaptation in a parasitoid's chances of reproducing in a new host. Journal of Insect Physiology, 120, art. 103987 [p.]. ISSN 0022-1910

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Lien direct chez l'éditeur doi:10.1016/j.jinsphys.2019.103987

Titre
Role of egg-laying behavior, virulence and local adaptation in a parasitoid's chances of reproducing in a new host
Année de publication2020
Type de documentArticle référencé dans le Web of Science WOS:000508490200014
AuteursBenoist R., Paquet S., Decourcelle F., Guez J., Jeannette Rémi, Calatayud Paul-André, Le Rü Bruno, Mougel F., Kaiser L.
SourceJournal of Insect Physiology, 2020, 120, p. art. 103987 [p.]. p. art. 103987 [p.] ISSN 0022-1910
RésuméUnderstanding the ability of parasitoid insects to succeed in new host populations is a relevant question for biological control and adaptive mechanisms. Cotesia typhae is an African parasitoid specialized on the moth Sesamiae nonagrioides, also called the Mediterranean corn borer. Two Kenyan strains of C. typhae differ in their virulence against a new host population from France. We explored behavioral and physiological hypotheses about this differentiation. Cotesia genus belongs to a group of Hymenoptera in which females inject a domesticated virus in their host to overcome its resistance. Since viral particles are injected along with eggs and since the strain with the higher virulence injects more eggs, we hypothesized that virulence could be explained by the quantity of virus injected. To test this assumption, we measured the injected quantities of eggs and viral particles (estimated by viral DNA segments) of each parasitoid strain along several ovipositions, to vary these quantities. Unexpectedly, results showed that virulence against the French host was not correlated to the injected quantities of eggs or viral segments, indicating that virulence differentiation is explained by other causes. The virulence against the respective natural hosts of the two C. typhae strains was also measured, and results suggest that local adaptation to a more resistant natural host may explain the pre-adaptation of one strain to the new host population. We also identified a differentiation of oviposition strategy and subsequent offspring number between the parasitoid strains, which is important in a biocontrol perspective.
Plan de classementSciences du monde végétal [076] ; Sciences du monde animal [080]
LocalisationFonds IRD [F B010077827]
Identifiant IRDfdi:010077827
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010077827

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