Chemical characterization of contact semiochemicals for host-recognition and host-acceptance by the specialist parasitoid <Emphasis Type="Italic">Cotesia plutellae</Emphasis> (Kurdjumov) |
| |
Authors: | Olivier Roux Charles Gers Josèphe Nathan Tene-Ghomsi Laurence Arvanitakis Dominique Bordat Luc Legal |
| |
Institution: | (1) Laboratoire Dynamique de la Biodiversité, UMR-CNRS 5172, Université Paul Sabatier, Bat 4R3, 31062 Toulouse cedex 9, France;(2) école Nationale de Formation Agronomique, 2 route de Narbonne, 31326 Castanet-Tolosan cedex, France;(3) CIRAD, UPR Horticulture, TA 40/L, CSIRO, Campus international de Baillarguet, 34398 Montpellier Cedex 5, France |
| |
Abstract: | Summary. Cotesia plutellae is a specialist parasitoid of Plutella xylostella. This specificity is potentially under the control of several factors before and after oviposition. Thereby, the stimuli
that lead female parasitoids to host locations and to oviposition, might be at the basis of the specificity. We explore here
the response of C. plutellae females exposed to host cuticular lipids. A total cuticular lipid extract of host caterpillars was fractionated into a hydrocarbon
fraction and a non-hydrocarbon fraction. Neither fraction alone had any effect on oviposition behaviour in C. plutellae but the hydrocarbon fraction alone did seem to have a positive effect on the rate of antennal contact by the females. To
induce oviposition behaviour, both fractions were necessary and reflect cooperation between at least one compound in each
fraction. Identification of cuticular lipids shows that hydrocarbons were dominant (77%). Non-hydrocarbon compounds were mainly
represented by 15-nonacosanone (18% of the total lipid extract). This ketone is rare in insect cuticle lipids and is thought
to originate from the cabbage epicuticle where it is dominant with n-C29 and 14- and 15-nonacosanol also found among the cuticular lipids of the host caterpillar. |
| |
Keywords: | Cotesia plutellae Plutella xylostella cuticular lipids host-recognition host-acceptance parasitoid |
本文献已被 SpringerLink 等数据库收录! |
|