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Heat tolerance changes with age in normal and irradiated Drosophila melanogaster.

M. Lamb,R. McDonald

Published 1973 in Experimental Gerontology

ABSTRACT

Abstract The survival times in dry air at 35°C of adult male Drosophila melanogaster which had been irradiated when 2 days old with 35 krad 60 Co γ-rays were compared with those of unirradiated control flies. With increase in age survival times decreased for both control and irradiated flies, but until middle age the irradiated flies survived longer than the controls. In saturated air the controls had greater survival times than irradiated flies of the same age. It is concluded that the relative survival times in dry air were in part a reflection of differences in the abilities of flies to withstand desiccation and that the greater survival times of irradiated flies may have been due to factors such as lower activity which reduced the rate of water loss. The results are discussed in relation to theories of radiation-induced life-shortening and it is suggested that they are not incompatible with the theories which suggest that radiation may affect the natural ageing process.

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