Membrane potentials in excitable cells of aldrovanda vesiculosa trap-lobes

Toshio Iijima, Takao Sibaoka

    Research output: Contribution to journalArticlepeer-review

    45 Citations (Scopus)

    Abstract

    The resting membrane potential in excitable cells of Aldrovanda trap-lobes is composed of diffusion and electrogenic potentials. The diffusion potential, about -100 mV in artificial pond water, was determined from the external K+ and Na+ concentrations. The permeability ratio, PNa/PK of the membrane was estimated to be about 0.3. The electrogenic potential hyperpolarized the membrane to about -140 mV. The peak value of the action potential increased by +26 mV with a tenfold increase in the external Ca2+ concentration. The action potential was blocked by an application of the Ca2+ chelater or the Ca channel blocker, LaCl3. Cells showed additional Ca2+ influx (7.8 pmole/cm2 impulse) during membrane excitation. These facts suggest that the transient increase in Ca2+ influx causes the action potential present in cells of Aldrovanda trap-lobes.

    Original languageEnglish
    Pages (from-to)1-13
    Number of pages13
    JournalPlant and Cell Physiology
    Volume26
    Issue number1
    Publication statusPublished - 1985 Jan 1

    Keywords

    • Action potential
    • Aldrovanda vesiculosa
    • Electrogenic pump
    • Transient Ca2+ influx

    ASJC Scopus subject areas

    • Physiology
    • Plant Science
    • Cell Biology

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