Reports

Action Spectra for Phase Shifts of a Circadiain Rhythm in Drosophila

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Science  14 Feb 1969:
Vol. 163, Issue 3868, pp. 688-689
DOI: 10.1126/science.163.3868.688

Abstract

Action spectra were determined for lightinduced phase shifts of the circadian rhythm of adult emergence in Drosophila pseudoobscura. The action spectra for advance and delay phase shifts are similar; the most effective wavelengths are in the blue region, with a sharp cutoff above 500 nanometers. This similarity suggests that the same photoreceptive pigment mediates both advance and delay phase shifts.