Chemoreceptors on the proboscis of the female eastern spruce budworm: electrophysiological study
1975
Städler, Erich | SEABROOK, W.D.
The physiology of the sensilla styloconica on the proboscis of the female spruce budworm was studied using tip- and sidewall-recording techniques. One receptor cell showed a concentration-dependent response to sucrose and honey solutions with an immediate rise of the spike activity which adapted within one second to half the initial frequency. Stimulation with distilled water, sodium and potassium chloride gave a completely different response. After an initial delay, which varied from 100 ms to several seconds, the spike frequency of a second cell increased slowly and then remained at a constant rate until the end of the stimulation. Whereas the spike frequency seemed to be independent of concentration, the delay period following stimulus onset tended to increase with higher salt concentrations. The response of one cell was elicited by contact of the receptor tip with a balsam fir needle. However, contact with a glass capillary gave a similar response, suggesting mechanoreception but no chemoreception of host plant chemicals.
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