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'Cotyledons' in keywords Facet   Publication Year 1990  [X]
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1990[X]
1Author    Petra Sperling, Ute Hammer, Wolfgang Friedt, Ernst HeinzRequires 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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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-0166.pdf 
 Identifier    ZNC-1990-45c-0166 
 Volume    45