| Title: | Chemosensory and Behavioural Responses of Ixodes scapularis to Natural Products: Role of Chemosensory Organs in Volatile Detection |
| Author(s): | Faraone N; Light M; Scott C; MacPherson S; Hillier NK; |
| Address: | "Department of Chemistry, Acadia University, Wolfville, NS B4P 2R6, Canada. Department of Forestry, University of Toronto, Toronto, ON M5S 1A1, Canada. Department of Biology, Acadia University, Wolfville, NS B4P 2R6, Canada" |
| ISSN/ISBN: | 2075-4450 (Print) 2075-4450 (Electronic) 2075-4450 (Linking) |
| Abstract: | "Blacklegged ticks, Ixodes scapularis, represent a significant public health concern due to their vectoring of tick-borne disease. Despite their medical importance, there is still limited knowledge of the chemosensory system of this species, and thus a poor understanding of host-seeking behaviour and chemical ecology. We investigated the electrophysiological sensitivity of adult female blacklegged ticks to attractants and plant-derived compounds via an electrode inserted into the scutum. The response of female ticks to binary mixtures with a constant concentration of a selected attractant (butyric acid) and increasing concentration of volatile organic compounds (VOCs) (geraniol, phenethyl alcohol, beta-citronellol, and citral) was recorded. A strict relationship between increasing volatile concentration and a decreasing response was observed for each VOC. Y-tube bioassays confirmed that tick attraction towards butyric acid decreased with the presence of a VOC, which exerted a deterrent effect. To determine the specific role of sensory appendages involved in the detection of attractant chemical stimuli, we tested tick electrophysiological response after removing appendages that house chemosensory sensilla (foretarsi, pedipalps, or both). The chemosensory response was related to the molecular structure of attractant odorant, and the lack of pedipalps significantly reduced olfactory responses, suggesting they play an important role in detecting attractants. This study provides new insight into the neurophysiological mechanisms underlying tick olfaction and the potential for interactions between attractant and deterrent chemical detection" |
| Keywords: | Ixodes scapularis VOCs attractant chemosensory organs deterrent inhibitory mixture interactions scutum terpenoids tick electrophysiology; |
| Notes: | "PubMed-not-MEDLINEFaraone, Nicoletta Light, Michael Scott, Catherine MacPherson, Samantha Hillier, N Kirk eng Venture Grant/CanLyme/ RGPIN-2017-04319/Natural Sciences and Engineering Research Council of Canada/ 22087/Canada Foundation for Innovation/ Switzerland 2020/08/08 Insects. 2020 Aug 4; 11(8):502. doi: 10.3390/insects11080502" |
