Abstract
The effect of Ca 2+ entry blockers on the light-induced chloroplast movements in Mougeotia was studied. The organic inhibitors diltiazem, nifedipine and ruthenium-red and the inorganic inhibitors La 3+ and Co 2+ do not affect the low or high fluence rate movements of chloroplasts. Only at toxic concentrations or after long-term incubations (4 – 7 days), which partially damage the cells, is chloroplast movement slightly inhibited. The P fr-mediated increase in chloroplast anchorage and the chloroplast anchorage of dark-sensitized algae are not significantly altered by Ca 2+ entry blockers within physiological concentrations. Our results contradict the hypothesis of a P fr-controlled Ca 2+ influx as an essential link in the signal transduction chain of light-oriented chloroplast movements in Mougeotia.
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