Movements of K^+ during Shutting and Opening of the Trap-Lobes in Aldrovanda vesiculosa

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K^+ movements during the shutting and subsequent opening of trap-lobes in Aldrovanda vesiculosa were measured using ^<86>Rb as a tracer for K^+. Immediately after the shutting, a large amount of ^<86>Rb pre-loaded in the trap-lobes was detected in the hollow space inside the shut trap. This may indicate that much of the K^+ in the active motor cells leaks out during the shutting, resulting in turgor loss in the cells. ^<86>Rb(K^+) uptake in the trap was active. During the opening process, enhanced ^<86>Rb uptake was observed. The time course of this uptake was similar to that of the opening of the trap-lobes, and both courses were accelerated by IAA. Enhanced K^+ uptake may restore the turgor in active motor cells. The quantity of K^+ that moved during the shutting or opening was estimated as 20% of that in the active motor cells in the open state of the trap-lobes. The K^+ efflux across the membranes of the active motor cells may be caused by a large increase in bulk flow triggered by an action potential, and was estimated as 6,200 pmol・cm^<-2>.
日本植物生理学会の論文