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Studies on seed-oil triglycerides. Triglyceride biosynthesis and storage in whole seeds and oil bodies of Crambe abyssinica.

1 
Crambe seeds harvested 6—30 days after flowering actively incorporated radioactive precursors into lipids. The distribution of label among the different lipid classes depended on the precursor, the age of the seed, and the duration of the incubation. 
 
2 
Labelled acetate was incorporated preferentially into phospholipids of whole seeds but the proportion of the radioactivity located in triglycerides increased as the age of the seed increased. 
 
3 
Uniformly labelled glucose was incorporated readily into the glycerol moiety of glycerolipids but not at all into the fatty acid moiety. The largest proportion was found in the phospholipid fraction and this proportion increased as the age of the seed increased, in contrast to labelled acetate. 
 
4 
Uniformly labelled glycerol was actively incorporated into glycerolipids of whole seeds. Phospholipids were the first fraction to be labelled, and in this fraction labelled phosphatidic acid could be detected at early time periods. Subsequently, diglycerides became labelled and finally triglycerides. Labelled glycerol was quickly converted into a number of water-soluble metabolites, one of the most rapidly labelled of which was glycerol phosphate. Taken together these data are consistent with the presence of the glycerol phosphate pathway for triglyceride synthesis in maturing Crambe seeds. 
 
5 
A fat fraction has been isolated from mature and maturing Crambe seeds by homogenisation of the seeds followed by flotation in the centrifuge. Electron microscopic examination indicated that the fraction contains the oil bodies that are the storage form of the oil in the seed in vivo. 
 
6 
The isolated oil bodies contain 75% by weight of lipid and 19% of protein. About 90% of the lipid is triglyceride, the remainder is mostly phospholipid. No glycolipid is present. 
 
7 
The isolated fat fraction catalysed the conversion of different substrates, malonyl-CoA, long chain acyl-CoA and glycerol 3-phosphate into lipids. Evidence is presented that this is not due to contamination from other cell fractions.