Title of article :
Complexity of the cold acclimation response in Drosophila melanogaster
Author/Authors :
Rako، نويسنده , , Lea and Hoffmann، نويسنده , , Ary A. Hoffmann، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2006
Pages :
11
From page :
94
To page :
104
Abstract :
Insects can increase their resistance to cold stress when they are exposed to non-lethal conditions prior to the stress; these plastic responses are normally described only in terms of immediate effects on mortality. Here we examine in Drosophila melanogaster the short- and longer-term effects of different conditions on several measures of cold resistance, but particularly chill coma recovery. Short-term exposure to sublethal temperature (cold hardening) did not decrease chill coma recovery times even though it decreased mortality. Exposure to 12 °C for 2 days (acclimation) decreased chill coma recovery times for a range of stressful temperatures when flies were cultured at 25 °C, but did not usually affect recovery times when flies were cultured at 19 °C. In contrast, 2-day exposure to 12 °C decreased mortality regardless of rearing temperature. Rearing at 19 °C decreased mortality and chill coma recovery time relative to rearing at 25 °C. Acclimation increased the eclosion rate of eggs from stressed females, but did not affect development time or size of the offspring. These results indicate that plastic responses to cold in D. melanogaster are complex when resistance is scored in different ways, and that effects can extend across generations.
Keywords :
Drosophila melanogaster , Cold stress acclimation , Chill coma recovery , maternal effects
Journal title :
Journal of Insect Physiology
Serial Year :
2006
Journal title :
Journal of Insect Physiology
Record number :
1414003
Link To Document :
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