Substances interfering with phosphatidyl inositol signalling pathway affect ultradian rhythm of Desmodium motorium

摘要

The ultradian rhythm of the lateral leaflets of Desmodium motorium (Houtt.) Merril. was recorded with a picture analysis method using a video camera and a computer. The periods are in the minute range and depend strongly on temperature. The phosphatidyl inositol signal chain might he involved in the ultradian rhythm of the lateral leaflet movement of Desmodium motorium: Myoinositol shortens the period length and reduces the known period lengthening effect of lithium ions. Neomycin, which inhibits the hydrolysis of phosphatidylinositol-4, 5-biphosphate to inositol-4-phosphate and diacylglycerin, lengthens the period of the rhythm at low concentrations (0·2 mM).