| | 1 | Author
| Petra Sperling, Ute Hammer, Wolfgang Friedt, Ernst Heinz | Requires cookie* | | | Title
| High Oleic Sunflower: Studies on Composition and Desaturation of Acyl Groups in Different Lipids and Organs  | | | | Abstract
| A selection o f lipids from achenes, cotyledons after germination, roots and leaves o f normal and high oleic varieties o f sunflower were analyzed with regard to their fatty acid profiles. The lipids included triacylglycerol and phosphatidylcholine as ER-made components and mono-and digalactosyl diacylglycerol as plastid-localized glycolipids. A comparison o f fatty acid pat terns showed that the block in oleate desaturation o f the high oleic variety is confined to the ER o f fat accumulating embryos, but that upon germination the oleate desaturation in the cotyledonary ER is rapidly derepressed. These data are supported by enzymatic experiments. In m icrosomes from maturing fruits o f the high oleic variety oleoyl-phosphatidylcholine de-saturase could not be detected, whereas o leo y l-C o A : lyso-phosphatidylcholine acyltransferase and com ponents o f the microsomal electron transport chains were not affected. A correlation in the expression o f desaturation blocks in seed and root fatty acids as observed in mutants o f other species was not observed which, therefore, cannot be generalized. Our data are discussed in terms o f the existence o f two ER-specific oleate desaturase activities. | | | |
Reference
| Z. Naturforsch. 45c, 166 (1990); received November 20 1989 | | | |
Published
| 1990 | | | |
Keywords
| Triacylglycerols, G alactolipids, Phosphatidylcholine, Cotyledons, Leaves, Roots | | | |
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| default:Reihe_C/45/ZNC-1990-45c-0166.pdf | | | | Identifier
| ZNC-1990-45c-0166 | | | | Volume
| 45 | |
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