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Unique after-hyperpolarization accompanying action potential inChara globularis

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Abstract

A unique after-hyperpolarization was found in internodal cells ofChara globularis. The cells generated an ordinary action potential due to regenerative depolarization induced by the outward electric current pulse larger than a threshold stimulus. After reaching a depolarizing peak, the membrane potential repolarized and overshooted the resting potential to a value which was somehow 40 mV more negative than the resting potential before stimulation (after-hyperpolarization). Since the membrane resistance increased during the after-hyperpolarization, the after-hyperpolarization is thought to be caused by an increase in the resistance (decrease in the conductance) of the passive diffusion channel.

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Author notes

  1. Teruo Shimmen

    Present address: Department of Life Science, Faculty of Science, Himeji Institute of Technology, 678-12, Harima Science Park City, Hyogo, Japan

Authors and Affiliations

  1. Department of Botany, Faculty of Science, University of Tokyo, 113, Hongo, Tokyo, Japan

    Teruo Shimmen

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  1. Teruo Shimmen
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Shimmen, T. Unique after-hyperpolarization accompanying action potential inChara globularis . J. Plant Res. 107, 371–375 (1994). https://doi.org/10.1007/BF02344059

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  • DOI: https://doi.org/10.1007/BF02344059

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