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Cold shock and heat shock: a comparison of the protection generated by brief pretreatment at less severe temperatures
Author(s) -
CHEN CHENGPING,
LEE RICHARD E.,
DENLINGER DAVID L.
Publication year - 1991
Publication title -
physiological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 57
eISSN - 1365-3032
pISSN - 0307-6962
DOI - 10.1111/j.1365-3032.1991.tb00539.x
Subject(s) - biology , glycerol , flesh fly , shock (circulatory) , heat shock , heat shock protein , botany , biochemistry , medicine , larva , gene
Brief exposure to low (0 o C) or high (40 o C) temperature elicits a protective response that prevents injury when the flesh fly, Sarcophaga crassipalpis Macquart, is subjected to more severe cold (‐10 o C) or heat (45 o C). Both the low and high temperature responses were found in all developmental stages of the fly, but were most pronounced in the pupal and pharate adult stages. The protective responses generated by brief exposure to 0 or 40 o C appear similar in that both result in a rapid acquisition of cold or heat tolerance and a loss of protection after the flies are returned to 25 o C. The protection generated by chilling is obvious within 10 min of exposure to 0 o C while a 30 min exposure to 40 o C is required to induce the high temperature protection. High temperature protects against cold shock injury within a narrow range (around 36 o C) but we have no evidence that low temperature can protect against heat injury. We previously demonstrated that the rapid increase in cold tolerance correlates with concomitant increases in glycerol concentration, but in this study we found no significant elevation in glycerol in heat‐shocked flies. Thus the physiological and biochemical bases for the rapid responses to cold and heat appear to be different.