title: Response profile of pheromone receptor neurons in male Grapholita molesta (Lepidoptera: Tortricidae).
abstract: The response profile of olfactory receptor neurons (ORNs) of male Grapholita molesta (Busck) to the three female sex pheromone components [(Z)-8-dodecenyl acetate (Z8-12:Ac), (E)-8-dodecenyl acetate (E8-12:Ac), and (Z)-8-dodecenyl alcohol (Z8-12:OH)] was tested with single sensillum electrophysiology. Sensilla trichodea housed normally one, but sometimes two or three ORNs with distinct action potential amplitudes. One third of the sensilla contacted contained ORNs that were unresponsive to any of the pheromone components tested. The remaining sensilla contained one ORN that responded either to the major pheromone component, Z8-12:Ac ("Z-cells", 63.7% of sensilla), or to its isomer E8-12:Ac ("E-cells", 7.4% of sensilla). 31% of Z- and E-sensilla had 1 or 2 additional cells, but these did not respond to pheromone. None of the 176 sensilla contacted hosted ORNs that responded to Z8-12:OH. The proportion of Z- and E-cells on the antennae (100:11.6, respectively) is similar to the proportion of these compounds in the blend (100:6, respectively). The response of Z-cells was very specific, whereas E-cells also responded to the Z isomer, albeit with lower sensitivity.
authors.affiliation: University of Lleida, Department of Crop and Forest Sciences, Av. Alcalde Rovira Roure 191, 25198 Lleida, Spain. Electronic address: nnnbyrareddy20@gmail.com.
authors.forename: Byrappa
authors.initials: B
authors.lastname: Ammagarahalli
authors.affiliation: University of Lleida, Department of Crop and Forest Sciences, Av. Alcalde Rovira Roure 191, 25198 Lleida, Spain. Electronic address: cesar.gemeno@pvcf.udl.cat.
authors.forename: César
authors.initials: C
authors.lastname: Gemeno
mesh_terms: D000818:Animals; D057506:Arthropod Antennae / Q000378:metabolism* / Q000648:ultrastructure; D004305:Dose-Response Relationship, Drug; D004594:Electrophysiology; D005229:Fatty Acids, Monounsaturated / Q000494:pharmacology*; D008297:Male; D008855:Microscopy, Electron, Scanning; D009036:Moths / Q000502:physiology*; D018034:Olfactory Receptor Neurons / Q000502:physiology; D058618:Sensilla / Q000378:metabolism / Q000648:ultrastructure; D012724:Sex Attractants / Q000494:pharmacology*
chemical_list: D005229:Fatty Acids, Monounsaturated; D012724:Sex Attractants; C026162:8-dodecenyl acetate
keywords: Grapholita molesta; Olfactory receptor neuron; Sensillum; Sex pheromone; Single sensillum recording