Effects of tetraethylammoniumchloride (TEA), vanadate, and alkali ions on the lateral leaflet movement rhythm of Desmodium motorium (Houtt.) Merr.
The period (approximately 3-5 min) of the ultradian rhythm of the lateral leaflet movement of Desmodium motorium is strongly lengthened (less than or equal to 30-40%) by the K+ channel blocker tetraethylammoniumchloride (20, 30, and 40 mM) and vanadate (0.5 and 1 mM), which is an effective inhibitor of the plasma membrane-bound H+ pump. The alkali ions K+, Na+, Rb+, and Cs+ (10-40 mM) shorten the period only slightly (less than or equal to 10-15%). Li+ (5-30 mM), however, increases the period of the leaflet rhythm drastically (less than or equal to 80%). We concluded that the plasmalemma-H(+)-ATPase-driven K+ transport through K+ channels is an essential component of the ultradian oscillator of Desmodium, as has been proposed for the circadian oscillator.
Weber
U
U
Institut für Botanik, Universität Tübingen, Germany.
Engelmann
W
W
Mayer
W E
WE
D000204:Activity Cycles; D002414:Cations, Monovalent / Q000494:pharmacology*; D002586:Cesium / Q000494:pharmacology; D002940:Circadian Rhythm; D004305:Dose-Response Relationship, Drug; D006863:Hydrogen-Ion Concentration; D008094:Lithium / Q000494:pharmacology; D009068:Movement / Q000187:drug effects; D018521:Plant Physiological Phenomena; D010944:Plants / Q000187:drug effects; D011188:Potassium / Q000494:pharmacology; D012413:Rubidium / Q000494:pharmacology; D012964:Sodium / Q000494:pharmacology; D019789:Tetraethylammonium; D013757:Tetraethylammonium Compounds / Q000494:pharmacology*; D014634:Valinomycin / Q000494:pharmacology; D014638:Vanadates / Q000494:pharmacology*
D002414:Cations, Monovalent; D013757:Tetraethylammonium Compounds; D002586:Cesium; D014634:Valinomycin; D014638:Vanadates; D019789:Tetraethylammonium; D008094:Lithium; D012964:Sodium; D012413:Rubidium; D011188:Potassium