| Rapid cold-hardening of Drosophila melanogaster (Diptera: Drosophiladae) during ecologically based thermoperiodic cycles. | |
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MedLine Citation:
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PMID: 11398755 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In contrast to most studies of rapid cold-hardening, in which abrupt transfers to low temperatures are used to induce an acclimatory response, the primary objectives of this study were to determine (i) whether rapid cold-hardening was induced during the cooling phase of an ecologically based thermoperiod, (ii) whether the protection afforded was lost during warming or contributed to increased cold-tolerance during subsequent cycles and (iii) whether the major thermally inducible stress protein (Hsp70) or carbohydrate cryoprotectants contributed to the protection afforded by rapid cold-hardening. During the cooling phase of a single ecologically based thermoperiod, the tolerance of Drosophila melanogaster to 1 h at -7 degrees C increased from 5 +/- 5% survival to 62.5 +/- 7.3% (means +/- S.E.M., N=40-60), while their critical thermal minima (CTmin) decreased by 1.9 degrees C. Cold hardiness increased with the number of thermoperiods to which flies were exposed; i.e. flies exposed to six thermoperiods were more cold-tolerant than those exposed to two. Endogenous levels of Hsp70 and carbohydrate cryoprotectants were unchanged in rapidly cold-hardened adults compared with controls held at a constant 23 degrees C. In nature, rapid cold-hardening probably affords subtle benefits during short-term cooling, such as allowing D. melanogaster to remain active at lower temperatures than they otherwise could. |
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Authors:
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J D Kelty; R E Lee |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: The Journal of experimental biology Volume: 204 ISSN: 0022-0949 ISO Abbreviation: J. Exp. Biol. Publication Date: 2001 May |
Date Detail:
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Created Date: 2001-06-08 Completed Date: 2001-07-19 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0243705 Medline TA: J Exp Biol Country: England |
Other Details:
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Languages: eng Pagination: 1659-66 Citation Subset: IM |
Affiliation:
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Department of Zoology, 212 Pearson Hall, Miami University, Oxford, OH 45056, USA. j-kelty@uchicago.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acclimatization* Aging Animals Carbohydrate Metabolism Cold Temperature* Cryoprotective Agents / metabolism Drosophila melanogaster / physiology* Female HSP70 Heat-Shock Proteins / metabolism Hot Temperature Male Periodicity* Sex Characteristics |
| Chemical | |
Reg. No./Substance:
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0/Cryoprotective Agents; 0/HSP70 Heat-Shock Proteins |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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