Blue Light Pulse-Induced Transient Changes of Electric Potential and Turgor Pressure in the Motor Cells of Phaseolus vulgaris L
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概要
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Blue light induces both depolarization of membrane potential in the motor cell and turgor movement in the laminar pulvinus of bean plant. This paper describes the changes of electric potential and turgor pressure induced in Phaseolus vulgaris L. by blue light pulses. A transient depolarization of membrane potential as large as 40 mV was induced by a short pulse of 15 s blue light in motor cells of the laminar pulvinus. This change was not an action potential because of the absence of a refractory period and threshold. The magnitudes of the response were dependent on the fluence of light. The response was long-lived, indicating that continuous input of light energy is not required for a sustained response. The potential change was always followed by a transient turgor movement of the pulvinus. A molecular mechanism similar to a model postulated for the blue light response of stomata may operate in the motor cell. However, the direction of the electrical response to blue light (depolarization) in the motor cell was the opposite of that in the guard cell (hyperpolarization). Turgor change of the motor cell by blue light was also opposite in direction (decrease).
- 日本植物生理学会の論文