Unexpected effects of sublethal doses of insecticide on the peripheral olfactory response and sexual behavior in a pest insect |
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Authors: | Lisa Lalouette Marie-Anne Pottier Marie-Anne Wycke Constance Boitard Françoise Bozzolan Annick Maria Elodie Demondion Thomas Chertemps Philippe Lucas David Renault Martine Maibeche David Siaussat |
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Institution: | 1.Sorbonne Université, UPMC—Paris 6,Institute of Ecology and Environnemental Sciences of Paris—Sensory Ecology Department,Paris,France;2.Institute of Ecology and Environnemental Sciences of Paris—Sensory Ecology Department,INRA,Versailles,France;3.Université de Rennes 1,UMR CNRS 6553 Ecobio,Rennes,France |
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Abstract: | Pesticides have long been used as the main solution to limit agricultural pests, but their widespread use resulted in chronic or diffuse environmental pollutions, development of insect resistances, and biodiversity reduction. The effects of low residual doses of these chemical products on organisms that affect both targeted species (crop pests) but also beneficial insects became a major concern, particularly because low doses of pesticides can induce unexpected positive—also called hormetic—effects on insects, leading to surges in pest population growth at greater rate than what would have been observed without pesticide application. The present study aimed to examine the effects of sublethal doses of deltamethrin, one of the most used synthetic pyrethroids, known to present a residual activity and persistence in the environment, on the peripheral olfactory system and sexual behavior of a major pest insect, the cotton leafworm Spodoptera littoralis. We highlighted here a hormetic effect of sublethal dose of deltamethrin on the male responses to sex pheromone, without any modification of their response to host-plant odorants. We also identified several antennal actors potentially involved in this hormetic effect and in the antennal detoxification or antennal stress response of/to deltamethrin exposure. |
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