Osmotropotaxis inDrosophila melanogaster |
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Authors: | Alexander Borst Martin Heisenberg |
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Institution: | (1) Institut für Genetik und Mikrobiologie, Röntgenring 11, D-8700 Würzburg, Federal Republic of Germany |
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Abstract: | Summary
Drosophila melanogaster is able to perform osmotropotaxis under open-loop conditions. With an optimal stimulus the average turning tendency to the side of higher concentration corresponds to a circular track with radiusr=0.8 cm. The response amplitude does not decrease within 1 or 2 h. Unilaterally antennectomized flies in an homogeneous odor field show a permanent turning tendency towards their intact side.The smallest concentration ratio to elicit osmotropotaxis in normal flies ranges between 6 10 and 9 10 at high and between 2 10 and 5 10 at an about 50 times lower odor intensity. No negative tropotaxis (i.e. turning to the side of lower concentration) is observed, even with strong repellents. |
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