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Unusual fatty acids in the lipids from organs and cell cultures ofPetroselinum crispum
Authors:Friedhelm Ellenbracht  Wolfgang Barz  Helmut K. Mangold
Affiliation:(1) Institut für Biochemie und Technologie-H.P. Kaufmann-Institut-der Bundesanstalt für Fettforschung, D-4400 Münster, Germany;(2) Institut für Biochemie der Pflanzen der Universität Münster, D-4400 Münster, Germany
Abstract:The lipids of seeds, leaves, and roots of parsley,Petroselinum crispum, and of heterotrophic as well as photomixotrophic cell cultures of this plant were characterized with the aim of finding a system for studying the biosynthesis of unusual fatty acids. It was found that (Z)-6-octadecenoic acid, petroselinic acid, which is the typical constituent fatty acid of triacylglycerols in seeds, occurs only in small proportions, if at all, in leaves, roots, and cell cultures of parsley. In all lipid classes studied petroselinic acid is accompanied by its (Z)-9- and (Z)-11-isomers, oleic and vaccenic acid, respectively. The phosphatidylcholines, phosphatidylethanolamines, and triacylglycerols of both heterotrophic and photomixotrophic callus cultures contain no petroselinic acid but rather oleic and vaccenic acids in equal ratios. Thus, cell cultures of parsley appear to be suitable for studying the biosynthesis of vaccenic acid. The constituent octadecadienoic acids in the lipids of various tissues and cell cultures of parsley consist almost exclusively of the (Z),(Z)-9,12-isomer, linoleic acid, which is derived from oleic acid. (Z),(Z)-6,9- and (Z),(Z)-11,14-Octadecadienoic acids, which could be expected as products of desaturation of petroselinic and vaccenic acids, were not found in any of the lipids of organs and cell cultures investigated.Abbreviations TLC thin-layer chromatography - GLC gas-liquid chromatography
Keywords:Fatty acid desaturation  Oleic acid  Petroselinic acid  Petroselinum  Vaccenic acid
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