Y. Nishizaki, EFFECTS OF BLUE-LIGHT ON ELECTRICAL POTENTIAL AND TURGOR IN PULVINAR MOTOR CELLS OF PHASEOLUS, Journal of plant research, 109(1093), 1996, pp. 93-97
Pulvinar motor cells of Phaseolus vulgaris L. display transient depola
rization of the membrane potential and a turgor pressure decrease when
exposed to a pulse of blue light. To analyze the mechanism of the tra
nsient depolarization, the effects of some factors such as anoxia, met
abolic inhibitors and specific inhibitors of H+-ATPase have been exami
ned. The findings have led to the conclusion that blue light inactivat
es the electrogenic H+-pumping ATPase in the plasma membrane of the mo
tor cells. This inactivation seems to suppress ion uptake and decrease
the turgor pressure of the motor cells.