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Journal of Lipid Research, Vol. 7, 221-225, March 1966
Copyright © 1966 by Lipid Research, Inc.

Desaturation of fatty acids in seeds of higher plants

H. J. Dutton and T. L. Mounts

Northern Regional Research Laboratory, Peoria, Illinois

Photosynthesizing flax, soybean, and safflower plants were exposed to ¹⁴CO₂ at seed-setting stage for a 1 hr period. Seed was sampled periodically thereafter and the lipids were extracted. A triglyceride-rich fraction was methanolyzed; the resultant methyl esters were analyzed by gas-liquid chromatography and assayed for radioactivity.

Of the C₁₈ unsaturated acids, oleic was the first to acquire radioactivity, which subsequently and successively appeared in linoleic and linolenic acids. The shapes of the radioactivity-time curves provide evidence that consecutive desaturation reactions occur in the seeds of these higher plants.

Supplementary key words desaturation • oleic acid • linoleic acid • triglycerides • seeds • flax • soybean • safflower • biosynthesis • linolenic acid • ¹⁴CO₂

Submitted on March 19, 1965
Accepted on October 26, 1965

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