Movements of K+ during shutting and opening of the trap-lobes in aldrovanda vesiculosa

Toshio Iijima, Takao Sibaoka

    Research output: Contribution to journalArticlepeer-review

    29 Citations (Scopus)

    Abstract

    K+ movements during the shutting and subsequent opening of trap-lobes in Aldrovanda vesiculosa were measured using 86Rb as a tracer for K+. Immediately after the shutting, a large amount of 86Rb 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. 86Rb(K+) uptake in the trap was active. During the opening process, enhanced 86Rb 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.

    Original languageEnglish
    Pages (from-to)51-60
    Number of pages10
    JournalPlant and Cell Physiology
    Volume24
    Issue number1
    DOIs
    Publication statusPublished - 1983 Jan

    Keywords

    • Aldrovanda vesiculosa
    • IAA
    • Rapid trap shutting
    • Trap opening

    ASJC Scopus subject areas

    • Physiology
    • Plant Science
    • Cell Biology

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