Advances in Insect Physiology, Vol. 11 by J. E. Treherne, M. J. Berridge, V. B. Wigglesworth

By J. E. Treherne, M. J. Berridge, V. B. Wigglesworth

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In addition, Hudson (1958) showed that flight, which greatly increased the rate of crop emptying, caused a corresponding increase in the rate at which threshold declined. These two pieces of information provided circumstantial evidence that the volume of the crop might directly affect threshold. Evans and Dethier (1957) directly investigated this possibility. 0 M glucose and found that, in both instances, threshold rose t o a high level following feeding, albeit for a shorter period than in normal flies.

These two pieces of information provided circumstantial evidence that the volume of the crop might directly affect threshold. Evans and Dethier (1957) directly investigated this possibility. 0 M glucose and found that, in both instances, threshold rose t o a high level following feeding, albeit for a shorter period than in normal flies. The result with flies ligated before feeding indicates that the threshold can rise even if the crop is empty, whereas that obtained with flies ligated after feeding shows that threshold can fall even when the crop remains full, and therefore that the possession of a full crop does not alone result in threshold elevation.

They found that there was no elevation of threshold even though the glucose solution, which had been introduced via the anus, filled the gut from the rectum forward t o the proventriculus. 0 M glucose was injected through the wall of the mid-gut. The presence of concentrated sugar solution in the mid-gut and hind-gut therefore did not alone cause an elevation in the tarsal threshold of P. rep'na t o sugar. In experiments discussed above, it was shown that threshold elevation occurred when ligation before feeding allowed sugar solution either into only the crop and fore-gut (Dethier and Bodenstein, 1958) or only the fore-gut, mid-gut and hind-gut (Evans and Dethier, 1957).

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