Photoperiodic Control of Adult Diapause, Cold Hardiness, and Inositol Accumulation in a Beetle, Aulacophora nigripennis(Coleoptera, Chrysomelidae)
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概要
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Adults of aulacophora nigripennis terminated diapause when transferred from outdoor conditions to a long photoperiod before February but remained in diapause when transferred to a short photoperiod. Both mating and vitellogenesis occurred at either photoperiod in adults examined in February or later. The supercooling point (SCP) of adults was about -6℃ in summer and -10 to -11℃ in late autumn and winter. Summer adults rapidly decreased the SCP to about -16℃ after deprivation of food for 4 days at 25℃, suggesting that the gut contents play an important role in lowering the SCP. Among the cryoprotectants known in insects, only myo-inositol was found accumulated in overwintering adults of A. nigripennis. Female adults accumulated more myo-inositol than males in February. An exposure of overwintering beetles to 25℃ caused a rapid decrease in myo-inositol level even at a short photoperiod. This indicated that the reduction in inositol may be independent of the termination of diapause.
- 社団法人日本動物学会の論文
著者
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Watanabe Masahiko
Department Of Agricultural Chemistry The University Of Tokyo
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Watanabe Masahiko
Department Of Insect Physiology And Behavior National Institute Of Sericultural And Entomological Sc
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Tanaka Kazuhiro
Zoological Section Institute Of Low Temperature Science Hokkaido University
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