Effects of anoxia and high CO_2 concentration on the electrogenic activity of leaf cell membrane in the dark
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Resting membrane potential of a single cell in Antirrhinum leaf depolarized rapidly by about 40% under anoxia in the dark and recovered to the normal level with reaeration. V_m in the dark comprised two fractions; one was passive diffusion potential and the other was intimately dependent on aerobic metabolism. The rapidity of the depolarization due to anoxia suggested the possible functioning of an electrogenic mechanism, although the level of V_m was not much higher than the equilibrium potential of K^+ across membrane. 50% CO_2 in air brought about slightly more complex responses: a slight transient hyperpolarization and a subsequent depolarization. Sometimes one more transient depolarization took place as a "CO_2 off" effect. The total depolarization span was equal to that caused by anoxia. 50% CO_2 under anoxia did not evoke further depolarization but only hyperpolarization.
- 日本植物生理学会の論文
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