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The capacity of both developing seeds and germinating seedlings of safflower for the incorporation of acetate-C(14) into long-chain fatty acids is examined. Intact tissue of the developing seed shows a low rate of acetate incorporation into fatty acid initially but between the tenth and twenty-fifth day after flowering the tissue has a high rate of synthesis, in particular with respect to the unsaturated fatty acids. Centrifuged fractionation of homogenates of this developmental tissue yielded several active fractions, the most active being the P(I) fraction consisting mostly of plastids. Cofactor requirements and pH effects are examined. Germinating tissue shows a more uniform capacity for synthesis of fatty acids since there is no marked change in synthetic capacity. The newly synthesized fatty acids are consistently palmitic, stearic, and oleic acid. No linoleic synthesis could be detected. The most active fraction of cell-free preparation of germinating tissue is the plastid fraction (P(I)), similar to what was formed with developing tissue.

plant physiology

Fat Metabolism in Higher Plants XXVI. Biosynthesis of Fatty Acids in Tissues of Developing Seeds and Germinating Seedlings of Safflower (<i>Carthamus tinctorius</i> L.)

Fat Metabolism in Higher Plants XXVI. Biosynthesis of Fatty Acids in Tissues of Developing Seeds and Germinating Seedlings of Safflower (Carthamus tinctorius L.)