Comparison of the circadian eclosion rhythm between non-diapause and diapause pupae in the onion fly,Delia antiqua |
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Authors: | Watari Yasuhiko |
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Institution: | Laboratory of Biotechnology, Faculty of Education, Ashiya University, Rokurokuso-cho 13-22, Ashiya, Hyogo 659-8511, Japan |
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Abstract: | The influence of pupal diapause on adult eclosion rhythm of Delia antiqua was investigated. When non-diapause and diapause pupae were exposed to various photoperiods at 15, 20 and 25 °C, both of them emerged as adults close to the light-on time, but the phase of eclosion varied with photoperiod and temperature. Moreover, there was a significant difference in the eclosion time between non-diapause and diapause pupae; the eclosion peak of diapause pupae was earlier than that of non-diapause pupae. When non-diapause and diapause pupae were transferred to constant darkness (DD) after having experienced LD 12:12 at 15, 20 and 25 °C, both showed circadian rhythmicity in eclosion. Although the free-running period (τ) decreased slightly as temperature increased in both non-diapause and diapause pupae, the latter tended to show shorter τ than the former. This observation suggests that the observed difference in eclosion time in LD cycles between non-diapause and diapause pupae is due to differences in τ. |
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Keywords: | Circadian rhythm Eclosion rhythm Photoperiod Diapause Onion fly |
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