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J Insect Physiol

Title:		"Structure and function of the antennal sensilla of the palm weevil Rhynchophorus palmarum (Coleoptera, Curculionidae)"
Author(s):		Said I; Tauban D; Renou M; Mori K; Rochat D;
Address:		"Unite de Phytopharmacie & Mediateurs Chimiques, INRA, Route de Saint-Cyr, 78026 Versailles Cedex, France"
Journal Title:		J Insect Physiol
Year:		2003
Volume:		49
Issue:		9
Page Number:		857 - 872
DOI:		10.1016/S0022-1910(03)00137-9
ISSN/ISBN:		0022-1910 (Print) 0022-1910 (Linking)
Abstract:		"The distribution, fine structure and function of the sensilla present on the antennal club of Rhynchophorus palmarum were studied. No sex dimorphism was observed. Scanning and transmission electron microscopy showed five types of hair-like structures, four of which were evenly distributed on the antennal club. Two types of hair (IV and V) showed wall pores, a characteristic of olfactory sensilla. The antenna numbers 11,190 +/- 3040 type IV and 7360 +/- 1500 type V hairs. Using single sensillum recording, we identified 17 types of olfactory receptor neurons (ORNs) on the basis of their responses to pheromone and host plant odors, triggering synergic behavioral responses. We characterized highly specific and sensitive ORNs tuned to the aggregation pheromone (18% ORNs; 0.01-1 ng response threshold) and to host plant odors such as ethyl acetate, ethanol, acetoin and guaiacol (10% ORNs; 1-10 ng response threshold). Eleven percent of the ORNs were more generalist, responding to several odors with low sensitivity. Nine percent of the ORNs showed a complex pattern of responses, being co-activated by the pheromone and plant odors. This suggests an interaction at the sensory neuron level between pheromone and plant odors, triggering synergic behavioral responses"
Keywords:		"Animals Dose-Response Relationship, Drug Female Male Odorants Pheromones/pharmacology Plants/chemistry Weevils/*anatomy & histology/drug effects/*physiology;"
Notes:		"MedlineSaid, Imen Tauban, Dominique Renou, Michel Mori, Kenji Rochat, Didier eng England 2005/11/01 J Insect Physiol. 2003 Sep; 49(9):857-72. doi: 10.1016/S0022-1910(03)00137-9"