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FEBS Lett. 2004 May 21;566(1-3):115-20.

Regulation of phosphatidylcholine biosynthesis under salt stress involves choline kinases in Arabidopsis thaliana.

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Physiologie Cellulaire et Moléculaire des Plantes, UMR CNRS 7632, Université Pierre et Marie Curie, 4, place Jussieu, 75252 Paris Cedex 05, France.


Increasing evidence suggests a major role for phosphatidylcholine (PC) in plant stress adaptation. The present work investigated the regulation of choline, PC and interconnected phosphatidylethanolamine biosynthesis in Arabidopsis thaliana L. as a function of cold- and salt- or mannitol-mediated hyperosmotic stresses. While PC synthesis is accelerated in both salt- and cold-treated plants, the choline kinase (CK) and phosphocholine cytidylyltransferase genes are oppositely regulated with respect to these abiotic treatments. Salt stress also stimulates CK activity in vitro. A possible regulatory role of CK in stimulating PC biosynthesis rate in salt-stressed plants is discussed.

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