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Int. J. Mol. Sci. 2012, 13(3), 3176-3188; doi:10.3390/ijms13033176
Article

Arabidopsis Serine Decarboxylase Mutants Implicate the Roles of Ethanolamine in Plant Growth and Development

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Received: 1 February 2012 / Revised: 20 February 2012 / Accepted: 1 March 2012 / Published: 7 March 2012
(This article belongs to the Special Issue Advances in Molecular Plant Biology)
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Abstract

Ethanolamine is important for synthesis of choline, phosphatidylethanolamine (PE) and phosphatidylcholine (PC) in plants. The latter two phospholipids are the major phospholipids in eukaryotic membranes. In plants, ethanolamine is mainly synthesized directly from serine by serine decarboxylase. Serine decarboxylase is unique to plants and was previously shown to have highly specific activity to L-serine. While serine decarboxylase was biochemically characterized, its functions and importance in plants were not biologically elucidated due to the lack of serine decarboxylase mutants. Here we characterized an Arabidopsis mutant defective in serine decarboxylase, named atsdc-1 (Arabidopsis thaliana serine decarboxylase-1). The atsdc-1 mutants showed necrotic lesions in leaves, multiple inflorescences, sterility in flower, and early flowering in short day conditions. These defects were rescued by ethanolamine application to atsdc-1, suggesting the roles of ethanolamine as well as serine decarboxylase in plant development. In addition, molecular analysis of serine decarboxylase suggests that Arabidopsis serine decarboxylase is cytosol-localized and expressed in all tissue.
Keywords: serine decarboxylase; ethanolamine; choline; phosphatidylethanolamine; phosphatidylcholine; Arabidopsis thaliana serine decarboxylase; ethanolamine; choline; phosphatidylethanolamine; phosphatidylcholine; Arabidopsis thaliana
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kwon, Y.; Yu, S.-I.; Lee, H.; Yim, J.H.; Zhu, J.-K.; Lee, B.-H. Arabidopsis Serine Decarboxylase Mutants Implicate the Roles of Ethanolamine in Plant Growth and Development. Int. J. Mol. Sci. 2012, 13, 3176-3188.

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