Shortening of the period of the circadian rhythm by a K+ channel blocker, tetraethylammonium, in the duckweed Lemna gibba G3.
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.
Kondo
T
T
National Institute for Basic Biology, Okazaki, Japan.
D002118:Calcium / Q000494:pharmacology; D002940:Circadian Rhythm / Q000502:physiology*; D018521:Plant Physiological Phenomena; D011188:Potassium / Q000378:metabolism; D015221:Potassium Channels / Q000187:drug effects*; D019789:Tetraethylammonium; D013757:Tetraethylammonium Compounds / Q000494:pharmacology*
D015221:Potassium Channels; D013757:Tetraethylammonium Compounds; D019789:Tetraethylammonium; D011188:Potassium; D002118:Calcium