Inhibition of aggregation by light in the cellular slime mold Dictyostelium discoideum |
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Authors: | Donat-P. Häder Kenneth L. Poff |
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Affiliation: | (1) MSU-DOE Plant Research Laboratory, Michigan State University, 48824 East Lansing, Michigan, USA;(2) Present address: Botanisches Institut, Fachbereich Biologie, Philipps-Universität, Lahnberge, D-3550 Marburg, Federal Republic of Germany |
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Abstract: | Aggregation of Dictyostelium amoebae is inhibited by light. White light intensities 102 W · cm-2 cause an inhibition which reaches a saturation at 2 · 103 W · cm-2. The action spectrum, based on photon fluence-response curves, shows a major peak around 405 nm and extends through most of the visible spectrum with a secondary maximum at about 530 nm. The action spectrum of the inhibition of aggregation resembles the action spectrum of accumulations of amoebae in light traps and the action spectrum of photodispersal from light traps; it does not resemble the action spectrum of phototaxis in pseudoplasmodia. |
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Keywords: | Aggregation Amoebae Dictyostelium Light inhibition Photoreceptor |
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