Abstract
A 46 kDa protein resembling immunochemically to the mammalian dually phosphorylated p38-MAPK was detected in wheat root cells under hyperosmotic conditions, using Western blot analysis. This protein accumulated in a time- and dose-dependent fashion and exhibited pharmacological sensitivity similar to the activated p38-MAPK. The application of a highly specific p38-MAPK inhibitor revealed that the p38-like MAPK is probably implicated in hyperosmotically induced tubulin cytoskeleton reorganization as well as in protoplast volume regulation and osmotic tolerance of wheat root cells. As far as we know, the p38-MAPK has not been previously reported in higher plants.
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