Transitions in Dictyostelium discoideum behaviour: Influence of calcium and fluoride on slug phototaxis and thermotaxis
Open Access
- 1 January 1984
- journal article
- research article
- Published by The Company of Biologists in Journal of Cell Science
- Vol. 65 (1), 111-121
- https://doi.org/10.1242/jcs.65.1.111
Abstract
Phototaxis and thermotaxis by slugs of Dictyostelium discoideum show transitions that result in bimodality in phototaxis and temperature-dependent orientation up or down temperature gradients. New steps in the sensory transduction chain for these kinds of behaviour are elucidated from studies using inorganic salts (Ca2+, EGTA, KF) and several mutants. KF enhances bimodality of phototaxis, improves the accuracy of thermotaxis, and affects the transition temperatures from positive to negative thermotaxis. Changing the Ca2+ concentration has effects on both phototaxis and thermotaxis. At low Ca2+ concentrations phototaxis and thermotaxis are enhanced. In the presence of EGTA or high concentrations of Ca2+ phototaxis becomes bimodal, thermotaxis is impaired and spontaneous turning is suppressed. These results obtained by changing Ca2+ concentrations are analogous to those obtained previously with sensory transduction mutations, which coordinately affect phototaxis and thermotaxis.This publication has 23 references indexed in Scilit:
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