Abstract
The photoperiodic clock in the vetch aphidMegoura viciae is generally accepted to be based on a non-circadian mechanism or “hourglass”, as no evidence has been found for the involvement of the circadian system in the photoperiodic response. By using a recently-devised protocol which discriminates between single and repeated night length measurement, we demonstrate here that long-night measurement inMegoura is executed in a repetitive way, and thus that its photoperiodic clock is based on a circadian oscillator after all. However, it is also apparent that the determination of short nights is not repetitive.
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Dedicated to our dear friend, the late Professor A. D. (tony) Lees who, sadly, died before we had a chance to discuss the data reported here.
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Vaz Nunes, M., Hardie, J. Circadian rhythmicity is involved in photoperiodic time measurement in the aphidMegoura viciae. Experientia 49, 711–713 (1993). https://doi.org/10.1007/BF01923957
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DOI: https://doi.org/10.1007/BF01923957