Phosphatidic acid signalling in cryptogein-elicited tobacco cells
Résumé
Phosphatidic acid (PA) is a conserved phopholipid second messenger involved in stress response, metabolism and development in animals and plants. PA can be either generated by phospholipase D-mediated hydrolysis of phospholipids or produced by the sequential action of phospholipase C (PLC) and diacylglycerol kinase (DGK). Biochemical and pharmacological approaches carried in our laboratory indicate that a PLC/DGK pathway is activated in tobacco cell culture elicited with the oomycetal protein cryptogein. These early signalling events taking place within the first 30 minutes following the elicitation are likely to locate in plasma membrane rafts, i.e. membrane compartment highly enriched in sterols and sphingolipids that serves as signalling platformes. PA originating from the cryptogein-induced PLC/DGK pathway is further believed to control oxidative burst through regulation of the raft-localized NADPH oxidase.
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