Effects of Anoxia and Red Light on Changes Induced by Blue Light in the Membrane Potential of Pulvinar Motor Cells and Leaf Movement in Phaseolus vulgaris L.
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概要
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In the dark, the membranes of the pulvinar motor cells of Phaseolus vulgaris L. were rapidly depolarized under anoxic conditions and repolarized with re-aeration. This change in potential may have been due to suppression by anoxia of a respiration-dependent, electrogenic ion pump in the motor cells. When the pulvinus was irradiated with blue light (BL) in the depolarized state under anoxic conditions, no marked depolarization occurred. Furthermore, a short pulse of BL did not induce transient depolarization. On continuous irradiation with red light (RL), the motor cell under anoxic conditions showed slow recovery of the depolarized membrane potential. When a pulse of BL was superimposed on the RL after the recovery, transient depolarization occurred again. The leaf showed a small downward movement under anoxic conditions but recovered with re-aeration. Upward movement of the leaf caused by continuous application of BL to flexor cells changed to a downward movement under anoxic conditions, and re-aeration led to a return to up-ward movement. Unidirectional irradiation by BL of the flexor side did not cause upward movement of the leaf under anoxic conditions. However, unidirectional irradiation of RL to the flex-or side caused downward movement of the leaf under anoxic conditions, which could be changed to upward movement by superimposition of irradiation with BL. The experimental results clearly show that BL acts mainly to inhibit (depolarize) an electrogenic component of the membrane potential in pulvinar motor cells which is dependent on a supply of energy from respiration or photophsphorylation.
- 日本植物生理学会の論文