Evolution of gustatory sensitivity in Yponomeuta caterpillars: sensitivity to the stereo-isomers dulcitol and sorbitol is localised in a single sensory cell |
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Authors: | P Roessingh K H Hora J J A van Loon S B J Menken |
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Institution: | (1) Institute for Systematics and Population Biology, University of Amsterdam, Kruislaan 320, 1098 SM Amsterdam, The Netherlands e-mail: Roessingh@bio.uva.nl; Fax: +31-20-5257754, NL;(2) Laboratory of Entomology, Agricultural University Wageningen, P.O. Box 8031 6700 EH Wageningen, The Netherlands, NL |
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Abstract: | The cellular localisation of the sensitivity to two host-plant specific larval phagostimulants was determined in Yponomeuta evonymellus and in inter-specific hybrids of Y. cagnagellus and Y. padellus. The combined results of cross-adaptation experiments, analysis of mixture responses and inter-spike interval distributions
indicated that the sensitivity for sorbitol and dulcitol is localised in the same cell in the investigated species. This result
suggests that during the evolution of the genus the main alteration in the mechanism of sugar-alcohol detection occurred at
the level of the receptor proteins. Relatively simple modification of this kind can, however, have large effects, since larvae
with modified receptor proteins will directly respond to the new stimulus while all central processing and resulting behaviour
can remain unmodified.
Accepted: 7 October 1998 |
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Keywords: | Taste Sensory physiology Tip recording Cross-adaptation Mixtures |
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