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Some effects of low temperature on the photoperiodic clock in Drosophila triauraria
Authors:TAKAO YOSHIDA  MASAHITO T. KIMURA
Affiliation:Department of Biology, Faculty of Science, Hokkaido University;*Division of Ecological Science, Graduate School of Environmental Earth Science, Hokkaido University, Japan
Abstract:Abstract. Prior studies revealed that the photoperiodic clock in Drosophila triauraria operates during the scotophase and the processes measuring scotophase are composed of two phases: the A phase which lasts 6–7 h from the onset of the scotophase and the B phase which follows the A phase. In this study the photoperiodic clock in this species was analysed by low-temperature pulses. Low temperature (5C) or a low-temperature (2C) pulse of 3 or 4 h decreased the induction of diapause when applied during the scotophase, but not when applied within the photophase. The low-temperature pulse showed two maxima of the effect, 0–4 h and 8–10 h after the onset of the scotophase, approximately corresponding to the A and B phases, respectively. It is considered that low temperature retards the time measurement processes operating during these phases. In the period which was rather insensitive to the diapause-preventing action of low temperature, i.e. 5-7h after the onset of the scotophase, substances or stimuli accumulated during the A phase may be converted to information required for operation of the machinery in the B phase. Experiments using a combination of low-temperature and light pulses suggested that low-temperature decreases the sensitivity to light, especially in the B phase.
Keywords:Drosophila triauraria    reproductive diapause    photoperiodic clock    low temperature
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