Circadian Systems: Longevity as a Function of Circadian Resonance in Drosophila melanogaster*

AUTOR(ES)

Pittendrigh, Colin S.

RESUMO

Drosophila melanogaster, which had been reared under standard conditions (25° and a 24-hr light/dark cycle involving 12 hr of light) were exposed, on the first day of adult life, to four environments (all at 25°) as follows: (i) a 24-hr day consisting of 12 hr light and 12 hr dark; (ii) a 21-hr day (10.5 hr light, 10.5 hr dark); (iii) a 27-hr day (13.5 hr light, 13.5 hr dark); and (iv) constant light. The experiment was repeated four times. In all four experiments the flies on a 24-hr day lived significantly longer than the flies in the other environments. This result, comparable to other observations on plants, indicates that eukaryotic systems as oscillators perform most effectively when they are driven close to their natural “circadian” frequency.

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