Cell
Volume 23, Issue 3, March 1981, Pages 799-807
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Article
An extracellular chemical signal controlling phototactic behavior by D. discoideum slugs

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Abstract

Developing cells of the cellular slime mold Dictyostelium discoideum release a low molecular weight metabolite (Slug Turning Factor, STF) which, at high uniform concentrations, interferes with phototaxis and thermotaxis by D. discoideum slugs. D. discoideum slugs migrating in darkness are repelled by (exhibit negative chemotaxis to) crude STF exudates. Dose-response curves relating the accuracies of phototaxis and negative chemotaxis to STF concentration indicate that, in both phototaxis and chemotaxis, slugs “measure” the ratios of STF concentrations on their opposite sides. Net STF release is enhanced by light. We propose that light, focused onto the slug's distal side by its convex surface, generates a lateral STF gradient in response to which the slug turns toward the light source.

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    Present address: Max-Planck-Institut für Biochemie, D-8033 Martinsried bei München, Federal Republic of Germany.

    Present address: Department of Biochemistry, Faculty of Science, Australian National University, Canberra City 2601, Australia.

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