Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 89:724-727 (1989)
© 1989 American Society of Plant Biologists

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Metabolism and Enzymology

Light-Stimulated Inositol Phospholipid Turnover in Samanea saman Pulvini 1

Increased Levels of Diacylglycerol

M. J. Morse2, Richard C. Crain, Gary G. Coté and Ruth L. Satter

Department of Molecular and Cell Biology, U-125, The University of Connecticut, Storrs, Connecticut 06268

Leaflet movement in Samanea saman is driven by an endogenous circadian clock and by light. We are investigating whether the effects of light on leaflet movement are mediated by increased inositol phospholipid turnover. We demonstrated previously that irradiation of excised pulvini with 15 to 30 seconds of white light decreases the levels of phosphatidylinositol monophosphate and phosphatidylinositol bisphosphate and increases the levels of inositol phosphates. We now report that the diacylglycerol level increases after 30 seconds of white light but returns to below the control level after 10 minutes of white light.

2 Present address: Botany Department, Connecticut College, New London, CT 06320.

1 This work was supported by National Science Foundation grants DMB 83-04613 and 88-04810 to R. L. S., and DMB 86-07857 to R. C. C. and R. L. S.




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[Abstract] [Full Text] [PDF]


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