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Light-dependent Induction of Polyunsaturated Fatty Acid Biosynthesis in Greening Cucumber Cotyledons.
MedLine Citation:
PMID:  16660723     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Greening cucumber (Cucumis sativus L.) cotyledons exhibited dramatic increases in the ability to desaturate exogenously added [1-(14)C]oleic acid and [1-(14)C]linoleic acid within 2 to 3 hours of illumination. These increases were effectively inhibited by 10 micrograms per milliliter cycloheximide. Oleate desaturation remained at a high level in constant light for 5 to 6 days after induction and then declined by about 50%; when returned to the dark, the tissue showed a sharp decrease in conversion of [(14)C]oleate to [(14)C]linoleate. Linoleate desaturation reached a maximum about 15 hours after induction and declined immediately thereafter while the tissue still was in the light; after induction had peaked return of the tissue to the dark showed a dramatic fall of linoleate desaturation. The changes in desaturation were correlated with the conversion of the principal fatty acid in the etiolated cotyledons, linoleate, to alpha-linolenate, and with the assembly of the chlorophyll-containing photosynthetic membranes. The incorporation of [1-(14)C]acetate into lipids showed no significant light stimulation. The role of light in the regulation of certain aspects of plant metabolism during development is discussed.
Authors:
D J Murphy; P K Stumpf
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant physiology     Volume:  63     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1979 Feb 
Date Detail:
Created Date:  2010-06-29     Completed Date:  2010-06-29     Revised Date:  2010-09-15    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  328-35     Citation Subset:  -    
Affiliation:
Department of Biochemistry and Biophysics, University of California, Davis, California 95616.
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