Abstract
Summary Protonema Cells Of The Moss Ceratodon Purpureus Accumulate Triacylglycerols With Two Acetylenic Acids, 9,12-Octadecadien-6-Ynoic Acid (18:2A) And 9,12,15-Octadecatrien-6-Ynoic Acid (18:3A), As Main Components. By Following The Incorporation Of The [ 14 C]-Precursors (Acetate, Linoleate, γ-Linolenate, α-Linolenate, Stearidonate And 18:2A) Into 18:3A In Triacylglycerol Accumulating Cells, The Pathway For Acetylenic Acids Could Be Established. 18:2A And 18:3A Could Be Synthesized By A Second Desaturation Of The Δ 6 Double Bond Of Linolenate And Stearidonate, Respectively. However The Major Pathway For 18: 3A synthesis was via a Δ 15 desaturation of 18:2A. Since 18:2A was found exclusively in the triacylglycerols of the cell, the triacylglycerols in Ceratodon purpureus can act either as a direct substrate for the Δ 15 desaturation or, alternatively, the 18:2A has to be detached, desaturated and reincorporated into triacylglycerols. These results, as well as recent results from developing sunflower seeds by Garces et al. (1994, in press), present evidence that, in contrast to the general believe, plant triacylglycerols are not metabolic inert molecules during the cell stage of triacylglycerol deposition.
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