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Sodium-1,2-C Acetate Incorporation in Roots of Frost-hardy and Less Hardy Alfalfa Varieties under Hardening Conditions.
MedLine Citation:
PMID:  16659189     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
When the temperature of incorporation of sodium acetate-1, 2-(14)C into lipids of alfalfa (Medicago media Pers. var. Rambler and Medicago sativa L. var. Caliverde) roots was lowered from 22 C to 1 C, elongation and desaturation of fatty acids and the labeling of phosphatidylcholine were strongly stimulated.Controlled hardening of alfalfa stimulated strongly the incorporation of sodium acetate-1, 2-(14)C into root lipids of the hardy variety Rambler, but only slightly in the case of the frost-sensitive variety Caliverde. When incorporation was done at 1 C at various times of hardening, labeling decreased significantly in linoleic acid with a corresponding increase in oleic acid. Hardening, therefore, repressed specifically the initial low temperature stimulation of oleic acid desaturation, without affecting the stimulation of elongation of palmitic acid and the desaturation of stearic acid at low temperature. The radioactivity in linoleic acid was slightly greater in hardy Rambler than in Caliverde throughout hardening.When feedings were done at 1 C at various times of hardening, labeling of phosphatidylcholine increased in Rambler while it decreased in Caliverde. Throughout the hardening period, when incorporation was done at 1 C, linoleic acid represented a higher percentage of the label in phosphatidylcholine than in phosphatidylethanolamine or triglycerides and its specific radioactivity was much greater in phosphatidylcholine than in phosphatidylethanolamine and triglycerides and in Rambler than in Caliverde. Phosphatidylcholine seems, therefore, to play a special part in linoleic acid synthesis and in its control during the acquisition of frost hardiness.
Authors:
G Grenier; H J Hope; C Willemot
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Plant physiology     Volume:  55     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  1975 May 
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:  906-12     Citation Subset:  -    
Affiliation:
Canada Department of Agriculture, Research Station, Ste-Foy, Quebec, G1V 2J3, Canada.
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