Changes in Stigma-Specific Lipids of Tobacco Plant during Flower Development

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Abstract
Tobacco stigma contained multiacyl glycerides having ω-hydroxy fatty acids in their molecules. These compounds were not detected in other organs; leaf, pith, root, petal, ovary, anther and seed. The content of multiacyl glycerides in stigma increased until anthesis and then decreased. Three lipid fractions corresponding to triacylglycerol, diacylglycerol and polar lipid contained significant amounts of ω-hydroxy fatty acids, oleic acid-a)-OH and linoleic acid-ω-OH. The amount of the triacylglycerol fraction was the largest. Although ω-hydroxy fatty acids were detected in the polar lipid fraction, the compounds did not appear in the fractions corresponding to phosphatidylcholine, phosphatidylethanolamine, phosphatidylinositol, phosphatidylglycerol, monogalactosyldiglyceride, digalactosyldiglyceride and sulfoquinovosyldiglyceride. The ω-hydroxy fatty acids were contained in both surface and cytoplasmic lipids of stigma at all stages of flower development.