Document Detail

Changes in the content of gamma-linolenic C18:3 (n-6) and stearidonic C18:4 (n-3) acids in developing seeds of viper's bugloss Echium vulgare L.
MedLine Citation:
PMID:  18066400     Owner:  NLM     Status:  MEDLINE    
Changes in the composition of fatty acids (FA) were determined in lipid extracts isolated from developing ovaries containing ovules and developing seeds of Echium vulgare L. The samples were collected successively over 20 days beginning with the first day after flowering. The contents of the n-6 FA family members, i.e., gamma-linolenic (GLA) (C(18:3)) and linoleic (LA) (C(18:2)) acids changed in a parallel manner and reached the maximum of 13.9% and 24%, respectively, on the 12th day, after which they fell systematically down to 8.6% and 18.2%, respectively, on the 20th day after flowering. Starting with day 13, the content of alpha-linolenic acid (ALA) (C(18:3) n-3) begins to grow intensively, from 24.2% to 39.3% on the 20th day after flowering. The increase in the content of stearidonic acid (SDA) (C(18:4) n-3), up to 10.5% on the 20th day after flowering, occurred steadily as the seeds developed, and was independent of the changes in the content of GLA and LA. The pattern of changes in the content of SDA, GLA, LA and ALA during the development of seeds, and the occurrence of SDA in the seed oil of other plants, demonstrate that the biosynthesis of SDA in the seeds is critically dependent on the presence of ALA. The above condition indicates that SDA biosynthesis in the seeds of Echium vulgare follows the scheme LA --> simultaneous, competitive, action of Delta(6) and Delta(15) desaturases, leading to the formation of GLA and ALA, respectively, and then ALA (Delta(6) des) --> SDA. The biosynthesis according to the scheme: GLA (Delta(15) des) --> SDA is highly unlikely.
Andrzej Stolyhwo; Jolanta Mol
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-12-09
Journal Detail:
Title:  Acta biochimica Polonica     Volume:  54     ISSN:  0001-527X     ISO Abbreviation:  Acta Biochim. Pol.     Publication Date:  2007  
Date Detail:
Created Date:  2008-01-07     Completed Date:  2008-08-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  14520300R     Medline TA:  Acta Biochim Pol     Country:  Poland    
Other Details:
Languages:  eng     Pagination:  741-6     Citation Subset:  IM    
Faculty of Human Nutrition and Consumer Sciences, Warsaw University of Life Sciences (SGGW), Warszawa, Poland.
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MeSH Terms
Echium / chemistry*,  embryology
Fatty Acids, Omega-3 / analysis*
Seeds / chemistry*
gamma-Linolenic Acid / analysis*
Reg. No./Substance:
0/Fatty Acids, Omega-3; 111174-40-4/stearidonic acid; 506-26-3/gamma-Linolenic Acid

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