ニカメイガ幼虫における体液中のグリセロールとトレハロース含量におよぼす低温の影響

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  • Effect of low temperature on glycerol and trehalose concentration in haemolymph of the rice stem borer, Chilo suppressalis Walker
  • ニカメイガ ヨウチュウ ニ オケル タイエキチュウ ノ グリセロール ト トレ

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Effect of low temperature on glycerol and trehalose concentration in haemolymph of rice stem borer larvae was studied. Glycerol formation in haemolymph of the mature larvae reared at 25±1°C was observed when these were stored at low temperatures such as 15°C, 10°C and 4°C, especially at 10°C. In the larvae reared at 25±1°C, glycerol formation in haemolymph of diapausing larvae induced under short day photoperiod was higher than that of non-diapausing types under long day photoperiod at low temperatures. However, once the diapause induced under short day photoperiod was broken by exposure to low temperature, glycerol concentration in haemolymph decreased. These phenomena were also observed in hibernating larvae collected in fields. Glycerol production was stimulated in non-diapausing larvae treated with JH-I. These observations show that in the rice stem borer glycerol formation may be related to diapause and low temperature. Trehalose concentration in haemolymph appeared to be more closely related to low temperature than to diapause.

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