%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Bichang'a, G. B.
%A Da Lage, J. L.
%A Sambai, K.
%A Mule, S.
%A Le Rü, Bruno
%A Kaiser, L.
%A Juma, G.
%A Maina, E. N.
%A Calatayud, Paul-André
%T Salivary alpha-amylase of stem borer hosts determines host recognition and acceptance for oviposition by Cotesia spp. (Hymenoptera, Braconidae)
%D 2018
%L fdi:010075677
%G ENG
%J Frontiers in Ecology and Evolution
%@ 2296-701X
%K parasitic wasp ; Cotesia flavipes ; Cotesia sesamiae ; Cotesia typhae ; protein perception ; host specificity ; oviposition
%M ISI:000467250600002
%P art. 228 [10 ]
%R 10.3389/fevo.2018.00228
%U https://www.documentation.ird.fr/hor/fdi:010075677
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-05/010075677.pdf
%V 6
%W Horizon (IRD)
%X Foraging insect parasitoids use specific chemical cues to discriminate between host and non-host species. Several compounds have been identified in "host location and acceptance." However, nothing is known about the molecular variations in these compounds that could account for host-range differences between parasitoid species. In a previous study, it was shown that during the host-finding process, contact between the braconid Cotesia flavipes and its host is crucial, and that alpha-amylase of oral secretions from the host plays a key role for host acceptance and oviposition by the parasitoid. The present study sought to establish whether the variations in this enzyme could explain specific host recognition in different host-parasitoid associations. Different species and populations of the C. flavipes complex specialized on graminaceous lepidopteran stemborers were used. Electrophoresis of alpha-amylase revealed different isoforms that mediate the parasitoid's oviposition acceptance and preference for a specific host. This discovery opens up new avenues for investigating the evolutionary processes at play in chemically-mediated host specialization in the species-rich Cotesia genus.
%$ 076 ; 080 ; 020