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Induction des préférences olfactive et gustative chez les lépidoptères foreurs de graminées en Afrique en l’Est : effet des expériences pré-imaginale et imaginale

Abstract : Among herbivorous insects, the selection of the host plant as an egg laying site and food is crucial for the survival and development of the offspring. The chemical senses - olfaction and gustation – of an insect are crucial in host plant selection. An olfactory-gustatory experience of plant chemical signals allows insects to optimize their search period and host identification. In this study, we tested the effect of pre-imaginal and imaginal experience for a new artificial diet (enriched in vanillin) on the induction of olfactory and food preference for this diet in three species of lepidopteran stem borers with different food spectra, namely Sesamia nonagrioides (polyphagous), Busseola fusca (oligophagous) and Busseola nairobica (monophagous). It was shown that the olfactory preference of females for the odor of the new diet could be induced by pre-imaginal and imaginal experience for this new diet and that this induction was intra-generational. It was however not linked to an increase in the sensitivity of the female antennae to vanillin. In addition, it depended on the species studied. It occurred after two generations only in the polyphagous species, after five generations in the monophagous species, and it was absent in the oligophagous species. Although several mechanisms may be involved in this induction, our results validate both the theory of Hopkins, neo-Hopkins principle and the chemical legacy in the species in which the induction occurred. The larvae exhibited generally the same olfactory preference than the adult females for the odors of the new diet but this preference was not correlated with their food preferences, indicating in larvae a discrepancy between olfaction and gustation.
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https://hal.archives-ouvertes.fr/tel-03002112
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Submitted on : Thursday, November 12, 2020 - 4:36:36 PM
Last modification on : Monday, December 13, 2021 - 9:16:40 AM
Long-term archiving on: : Saturday, February 13, 2021 - 8:05:51 PM

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  • HAL Id : tel-03002112, version 1

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Christophe Petit. Induction des préférences olfactive et gustative chez les lépidoptères foreurs de graminées en Afrique en l’Est : effet des expériences pré-imaginale et imaginale. Sciences du Vivant [q-bio]. Paris Saclay, 2015. Français. ⟨tel-03002112⟩

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