| Seasonal changes in phospholipid class and class-specific fatty acid composition associated with the onset of freeze tolerance in third-instar larvae of Eurosta solidaginis. | |
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MedLine Citation:
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PMID: 18194092 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Abstract Third-instar larvae of the goldenrod gall fly Eurosta solidaginis (Diptera: Tephritidae) are freeze tolerant in winter. During freezing, cell membranes must compensate for both low temperature and partial dehydration. Documented adaptations to low temperature include increased fatty acid unsaturation and enrichment of cone-shaped phosphatides, both of which inhibit formation of gel phase lipid domains. These changes appear inconsistent with adaptations known to prevent formation of the hexagonal II phospholipid phase at low water activities, namely, increased fatty acid saturation and increased proportions of cylindrical phosphatides. To address these inconsistencies, changes in E. solidaginis phospholipid composition and class-specific fatty acid composition were studied from August to November 2002. Cylindrical phosphatides, mostly phosphatidylcholine (PC), increased transiently and significantly, from 35% of the total to nearly 50%, during the transition from freeze susceptible to freeze tolerant. Monoenes in both PC and phosphatidylethanolamine (PE) represented 35% of total fatty acids in freeze-susceptible larvae but accumulated in PC to 48% and in PE to 42% in freeze-tolerant larvae. Moreover, PC accumulated the most unsaturated acid in this species, 18:3(n-3), to a significantly greater degree than PE. This combination of changes may represent a finely tailored response to both low temperatures and freeze-induced dehydration. |
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Authors:
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Nancy L Pruitt; Changrui Lu |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Physiological and biochemical zoology : PBZ Volume: 81 ISSN: 1522-2152 ISO Abbreviation: Physiol. Biochem. Zool. Publication Date: 2008 Mar-Apr |
Date Detail:
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Created Date: 2008-01-31 Completed Date: 2008-04-22 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100883369 Medline TA: Physiol Biochem Zool Country: United States |
Other Details:
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Languages: eng Pagination: 226-34 Citation Subset: IM |
Affiliation:
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Department of Biology, Colgate University, 13 Oak Drive, Hamilton, New York 13346. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Fatty Acids / classification, metabolism* Freezing* Larva / metabolism Phospholipids / metabolism* Seasons* Tephritidae / metabolism* Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Fatty Acids; 0/Phospholipids |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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