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Journal of Biological Rhythms
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Shortening of the Period of the Circadian Rhythm by a K+ Channel Blocker, Tetraethylammonium, in the Duckweed Lemna gibba G3

Takao Kondo

National Institute for Basic Biology, Myodaiji, Okazaki 444, Japan

The period of the circadian rhythm of uptake of K+ by Lemna gibba strain G3 (duckweed), cultured in a flow medium, was shortened by continuous application of 0.5 mM tetraethylammonium chloride (TEA), which functions as a K+ channel blocker in both animal and plant cells. Other quaternary ammonium ions shortened the period of the rhythm in direct proportion to their ability to block K+ channels in cells of the nervous system. Ca2+ appears to be specific in its ability to antagonize this action of TEA and of its analogues.

Journal of Biological Rhythms, Vol. 5, No. 3, 187-194 (1990)
DOI: 10.1177/074873049000500302
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