Classification of antennal olfactory receptors of the cockroach, Periplaneta americana L
Fujimura, K.; Yokohari, F.; Tateda, H.
Zoological Science 8(2): 243-255
Response spectra and characteristic stimulus intensity-response curves were investigated in the antennal receptor system of P. americana. Responses to 50 arbitrarily selected chemicals were recorded from receptor cells of all the various types of olfactory sensilla, identified by external structure. Most receptor cells (87%) examined could be classified into 1 of 8 groups and 1 pheromone-sensitive cell, on the basis of similarities in response spectra of each receptor cell. There was some overlap in the response spectra of the different groups. Stimulus-response curves of single receptor cells to various components were not always in parallel, thereby suggesting that the receptor may have multiple sites. Receptor cells classified physiologically into the same group are occasionally seen in 2 types of sensilla with different stimulus conducting systems. It is suggested that the receptor membrane may contribute mainly to the discriminatory properties of the sensory organ, while the stimulus conducting system plays an auxillary role.