Insect cold tolerance and repair of chill-injury at fluctuating thermal regimes: Role of 70 kDa heat shock protein expression. - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Cryo Letters Année : 2009

Insect cold tolerance and repair of chill-injury at fluctuating thermal regimes: Role of 70 kDa heat shock protein expression.

Résumé

Expression of heat shock proteins has been proposed as an underlying mechanism of increased cold tolerance in insects exposed to fluctuating thermal regimes (FTRs) in comparison to constant low temperatures (CLTs). We found that the levels of Pahsp70 mRNA increase by up to 3 orders in the linden bugs, Pyrrhocoris apterus exposed to FTR -5 degrees C (22h)/25 degrees C (2h). The 2h-long warm pulses, however, were not sufficient for accumulation of PaHSP70 protein and thus no significant difference in expression of PaHSP70 protein was detected between FTR and CLT regimes. Hence, we conclude that the accumulation of PaHSP70 protein is not the mechanism underlying the increased cold tolerance in P. apterus at the particular FTR used in this study. The relevance of some other possible mechanisms is discussed.
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Dates et versions

hal-00475859 , version 1 (23-04-2010)

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  • HAL Id : hal-00475859 , version 1

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Michaela Tollarova-Borovanska, Lisa Lalouette, Vladimir Kostal. Insect cold tolerance and repair of chill-injury at fluctuating thermal regimes: Role of 70 kDa heat shock protein expression.. Cryo Letters, 2009, 30 (5), pp.312-319. ⟨hal-00475859⟩
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