The action of sinusoidally modulated light on the membrane potential of Acetabularia

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概要

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• Cells of the alga Acetabularia crenulata were illuminated with light of sinusoidally modulated intensity of different frequencies and changes in membrane potential were measured with microelectrodes. The frequency response, investigated in the range of frequencies of 8 to 1/40 cycles/min, displayed the following features : 1. The slope of the frequency response is, according to our results, 6 db/octave or steeper. Experiments should be extended to higher frequencies to gain more information concerning the slope of the frequency response and, thus, of the number of reactions in the series. 2. The time course of changes in membrane potential caused by light reveals non-linearities in time-scale and amplitude, indicating that not only first-order reactions are involved. 3. Time constants are slightly influenced by the intensity of light. 4. Further evidence is given that the characteristic of the action of light is logarithmic. 5. A phenomenon similar to resonance is observed, which corresponds to the overshoots generated by square-wave illumination. Models show that this is not necessarily explained by feed-back systems, but also by counteracting parallel pathways.

• 日本植物生理学会の論文

著者

• HANSEN Ulf-Peter

  Institut fur Angewandte Physik

• Gradmann Dietrich

  Institut Fur Biologie Der Universitat

• Hansen Ulf-peter

  Institut Fur Angewandte Physik Neue Universitat

関連論文

• The Effect of Transthylakoid Proton Uptake on Cytosolic pH and the Imbalance of ATP and NAPDH/H^+ Production as Measured by CO_2- and Light -Induced Depolarisation of the Plasmalemma
• The action of sinusoidally modulated light on the membrane potential of Acetabularia

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