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. 2008 Aug;147(4):2017–2029. doi: 10.1104/pp.108.121335

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Copyright © 2008, American Society of Plant Biologists

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Figure 1. — A condensed scheme of glycerol metabolism in plants. Glycerol is phosphorylated to G3P by GK (GLI1). G3P can also be generated by G3Pdh via the reduction of DHAP in both the cytosol and the plastids (represented by the oval). G3P generated by this reaction can be transported between the cytosol and plastidial stroma. In the plastids, G3P is acylated with oleic acid (18:1) by the ACT1-encoded G3P acyltransferase. This ACT1-utilized 18:1 is derived from the stearoyl-acyl carrier protein (ACP)-desaturase (SSI2)-catalyzed desaturation of stearic acid (18:0). The 18:1-ACP generated by ACT1 either enters the prokaryotic lipid biosynthetic pathway through acylation of G3P or is exported out of the plastids as a CoA-thioester to enter the eukaryotic lipid biosynthetic pathway. Lyso-PA, Acyl-G3P; PA, phosphatidic acid; PG, phosphatidylglycerol; MGD, monogalactosyldiacylglycerol; DGD, digalactosyldiacylglycerol; SL, sulfolipid; DAG, diacylglycerol.