In Vivo Pathway of Oleate and Linoleate Desaturation in Developing Cotyledons of Cucumis sativus L. Seedlings | Zendy

Denis J. Murphy | Zendy; P.K. Stumpf | Zendy

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In Vivo Pathway of Oleate and Linoleate Desaturation in Developing Cotyledons of Cucumis sativus L. Seedlings

Author(s) -

Denis J. Murphy,

P.K. Stumpf

Publication year - 1980

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.66.4.666

Subject(s) - cucumis , galactolipids , phosphatidylcholine , linoleic acid , biochemistry , galactolipid , chemistry , oleic acid , linolenic acid , linolenate , fatty acid , phospholipid , biology , botany , chloroplast , membrane , gene

Exogenous [1-(14)C]oleic acid and [1-(14)C]linoleic acid were taken up and esterified to complex lipids by greening cucumber (Cucumis sativus L.) cotyledons. Both (14)C-labeled fatty acids were initially esterified to phosphatidylcholine prior to eventual accumulation in triacylglycerols and galactolipids. Kinetic data suggest that esterification occurs prior to desaturation and that phosphatidylcholine is the initial site of both [(14)C]-oleate and [1-(14)C]linoleate esterification and of [1-(14)C]oleate desaturation to [1-(14)C]linoleate. [1-(14)C]Linoleic acid was esterified more rapidly than [(14)C]oleic acid and its desaturation product, [1-(14)C]alpha-linolenate, occurred mainly on monogalactosyl diacylglycerol, although some was also observed on the other major acyl lipids, including phosphatidylcholine.

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