Different sensitivities of the sugar receptor of the lateral styloconic sensillum in fourth- and sixth-instar larvae of the spruce budworm Choristoneura fumiferana |
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Authors: | M. Panzuto and P. J. Albert |
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Affiliation: | (1) Department of Biology, Concordia University, 1455 De Maisonneuve Blvd W., Montreal, Quebec, Canada, H3G 1M8 |
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Abstract: | Female fourth- and sixth-instar larvae, Choristoneura fumiferana, were tested individually for the response of the sugar cell on the lateral styloconic sensillum to 25 mM/l concentrations of 12 carbohydrates. The spruce budworm showed an age-related change in responsiveness of the sugar cell. The order of stimulating effectiveness for fourth-instars was melibiose > sucrose > raffinose.These storage di- and trisaccharides are present in the host plant at the beginning of budbreak. Sixth-instars responded to sucrose > fructose> m-inositol. These findings are in accordance with those of a previous behavioural study on feeding preferences of sixth-instars. The response for both melibiose and raffinose does not change from fourth- to sixth-instars; however, it does for sucrose, fructose and m- inositol. |
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Keywords: | spruce budworm styloconic sensilla chemosensilla electrophysiology gustation sugars |
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