Abstract
The water receptor in the labellar taste hairs ofProtophormia terraenovae (Diptera, Calliphoridae) was examined electrophysiologically. On the basis of previous findings (Wieczorek and Koppl, 1978) which indicated remarkable similarities between the “sugar site” of the water receptor and the furanose site of the classical sugar receptor, the present investigation of the water receptor's sugar receptor properties led to the following results: 1. The furanose component of D-fructose is the efficient molecular conformation also in the water receptor, as can be concluded from experiments with freshly dissolved and equilibrium solutions of D-fructose. 2. The reactions of the water receptor to solutions of sugars in the absence of inhibiting salts vary for different sugars. Of three sugars tested D-trehalose inhibits with increasing concentrations more than D-glucose, while D-fucose is at high concentrations an even better stimulus than water. 3. There seems to be a correlation between the sugar site of the water receptor and its ability of water reception: In all labellar taste hairs which possess a water receptor, the water receptor is equipped with a sugar site.
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