Figure 9.

Sphingolipid composition, as determined by electrospray ionization tandem MS, of leaves of wild-type (WT) Arabidopsis, ads alleles and AtADS2 OE13. Lipids were extracted from young rosettes and analyzed as described in “Materials and Methods.” The data are from experiment 1 and are given as an average percentage of total measured sphingolipid class ± sd (n = 5). Lipid nomenclature is A(B:C)-d, where A is the sphingolipid class, B is the total carbons in the fatty amide plus base, C is the number of double bonds in the fatty acid or base, and D is the number of free hydroxyl groups.