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STUDIES OF SIGNAL TRANSDUCTION OF SALICYLIC ACID IN CUCUMBER CELLS

1LI ZhaoLiang 2YUAN YongBing 2LIU ChengLian 1CAO ZongXun (Tsao T H)1(Department of Plant Molecular and Developmental Biology,College of Life Sciences, Peking University, Beijing 100871)2(Department of Horticulture,  
For the first time, the signal transduction pathway of salicylic acid (SA) was investigated by using 3Hlabelling, thinlayer chromatography and anion exchange column chromatography. It was found that SA stimulated the activity of membrane bound phospholipase C (PLC), accelerated the breakdown of phosphatidylinositol4monophosphate (PIP) and phosphatidylinositol4,5bisphosphate (PIP2) and increased the levels of inositol1,4bisphosphate (IP2),inositol1, 4,5trisphosphate (IP3) and diacylglycerol (DAG). These indicated that signal transduction of SA was probably accomplished through the mediation of phosphatidylinositide signal transduction system in cucumber(Cucumis sativa L.).
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