Simplified schematic part of the fatty acid pathway known in plants.

<p>Blue shaded boxes indicate probable negatively correlated pathway while yellow boxes indicate positively correlated pathway due to presence of mutant FAD2 genes. Action of mutant <i>FAD2A</i> and <i>FAD2B</i> in the S-population while <i>FAD2A</i> QTL in the T-population stops desaturation of oleic acid (C18:1) to linoleic acid (C18:2). The capital letters in parenthesis (A-D) indicate the pathway through which fatty acids are produced by acyl carrier protein (ACP) synthesis within the plastid. ACCase, Acetyl-CoA carboxylase; FAS, fatty acid synthase; KAS, ketoacyl ACP synthetase; Δ9DES, Δ9 desaturase; ACS, acyl-CoA synthetase; FAT B, palmitoyl-ACP thioesterase; FATA, stearoyl-ACP thioesterase; FAE, fatty acid elongase, <i>FAD2</i>, fatty acid desaturase.