Induction and inhibition of diapause by the same photoperiod: Experimental evidence for a "double circadian oscillator clock"

Spieth H, Xue FS, Strauss K (2004)
JOURNAL OF BIOLOGICAL RHYTHMS 19(6): 483-492.

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Abstract
On the southern Iberian Peninsula, the seasonal life history of the large white butterfly, Pieris brassicae, comprises 2 different photoperiodically induced developmental arrests: a hibernation diapause at photophases < 11 h and an estivation diapause at photophases > 14 h. At intermediate photophases (12 h to 13 h), the butterfly responds with a nondiapause. Combined with the experimental setup to determine photosensitivity in insects, the different photoperiodic responses at long-, intermediate-, and short-night conditions were examined to gain more insight into the time measurement mechanism in R brassicae. The study reveals evidence for a "double circadian oscillator clock" mechanism that is based on 2 submechanisms, a "short-night determining system" and a separate "long-night determining system." This conclusion was drawn from the facts that an LD 9:15 long-night induces a hibernation diapause but inhibits an estivation diapause and, conversely, that an LD 16:8 short-night inhibits a hibernation diapause but induces an estivation diapause. This opposite effect of the same photoperiod supports the argument for the existence of 2 independent targets for light-dark cycles, interpreted as 2 antagonistic time measurement systems. The existence and independence of 2 systems was further shown by differences in long-night versus short-night responses regarding photosensitivity, temperature dependence, and heritable factors. The long-night measurement system is most effective in the 5th larval stage, is highly affected by temperature, and is easy to manipulate by selective inbreeding. The short-night measurement system is most effective in the 4th larval stage, is largely temperature compensated, and is not affected by experimental manipulation of the long-night measurement system.
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Spieth H, Xue FS, Strauss K. Induction and inhibition of diapause by the same photoperiod: Experimental evidence for a "double circadian oscillator clock". JOURNAL OF BIOLOGICAL RHYTHMS. 2004;19(6):483-492.
Spieth, H., Xue, F. S., & Strauss, K. (2004). Induction and inhibition of diapause by the same photoperiod: Experimental evidence for a "double circadian oscillator clock". JOURNAL OF BIOLOGICAL RHYTHMS, 19(6), 483-492.
Spieth, H., Xue, F. S., and Strauss, K. (2004). Induction and inhibition of diapause by the same photoperiod: Experimental evidence for a "double circadian oscillator clock". JOURNAL OF BIOLOGICAL RHYTHMS 19, 483-492.
Spieth, H., Xue, F.S., & Strauss, K., 2004. Induction and inhibition of diapause by the same photoperiod: Experimental evidence for a "double circadian oscillator clock". JOURNAL OF BIOLOGICAL RHYTHMS, 19(6), p 483-492.
H. Spieth, F.S. Xue, and K. Strauss, “Induction and inhibition of diapause by the same photoperiod: Experimental evidence for a "double circadian oscillator clock"”, JOURNAL OF BIOLOGICAL RHYTHMS, vol. 19, 2004, pp. 483-492.
Spieth, H., Xue, F.S., Strauss, K.: Induction and inhibition of diapause by the same photoperiod: Experimental evidence for a "double circadian oscillator clock". JOURNAL OF BIOLOGICAL RHYTHMS. 19, 483-492 (2004).
Spieth, Hubert, Xue, FS, and Strauss, K. “Induction and inhibition of diapause by the same photoperiod: Experimental evidence for a "double circadian oscillator clock"”. JOURNAL OF BIOLOGICAL RHYTHMS 19.6 (2004): 483-492.
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PMID: 16332347

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