Document Detail

Phospholipids and their fatty acids in infective juveniles of entomopathogenic steinernematid nematodes.
MedLine Citation:
PMID:  9467876     Owner:  NLM     Status:  MEDLINE    
The composition of phospholipids and their fatty acids was investigated in the infective juveniles (IJs) of four species of entomopathogenic nematodes: Steinernema carpocapsae (strain All), S. riobravis (strain Biosys 355), S. feltiae (strain UK76) and S. glaseri (strain NC). In newly emerged IJs of the four species, phospholipids comprised 15-18% dry weight of the total lipids (or 5-6% dry weight of the nematode), and phosphatidylethanolamine and phosphatidylcholine constituted about 40 and 30%, respectively, of the total phospholipids, with phosphatidylserine (PS) and phosphatidylinositol (PI) collectively accounting for about 25%. Qualitatively, the four species had identical total phospholipid (combined non-acidic and acidic fractions) fatty acid profiles, although there were some differences in the relative proportions (mol%) of specific fatty acids. The fatty acid composition of the total phospholipids in newly emerged IJs was dominated by C16 fatty acids, specifically C16:0 (14-18%), C16:1n-7 (up to 20%) and C16:4 (up to 26%), whereas the major C18 fatty acid was C18:1n-9 (20-23%). Polyunsaturated C20 fatty acids collectively made up 8-13% of the total composition. When newly emerged IJs were stored in distilled water at 25 degrees C, the proportions of C16:0 and C16:4 decreased with storage time, whereas C16:3n-3 increased (by 30-fold in S. glaseri). These changes were mostly observed in the acidic phospholipid fraction (mainly PI and PS). No evidence was found for a correlation between the fatty acid composition of the phospholipids and the relative ability of the IJs of the four Steinernema species to survive desiccation stress.
M N Patel; D J Wright
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology     Volume:  118     ISSN:  1096-4959     ISO Abbreviation:  Comp. Biochem. Physiol. B, Biochem. Mol. Biol.     Publication Date:  1997 Nov 
Date Detail:
Created Date:  1998-03-11     Completed Date:  1998-03-11     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9516061     Medline TA:  Comp Biochem Physiol B Biochem Mol Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  649-57     Citation Subset:  IM    
Department of Biology, Imperial College of Science, Technology and Medicine, Ascot, Berkshire, U.K.
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MeSH Terms
Fatty Acids / analysis*
Phospholipids / analysis,  chemistry*
Rhabditoidea / growth & development,  physiology*
Reg. No./Substance:
0/Fatty Acids; 0/Phospholipids

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