モンシロチョウ移植脳の光周期感受性とII型神経分泌細胞の変化

DOI 日本農学文献記事索引 Web Site 被引用文献1件
  • 河野 義明
    東京大学農学部 武田薬品工業株式会社農薬研究所

書誌事項

タイトル別名
  • Photoperiodic Sensitivity of the Implanted Brain of <i>Pieris rapae crucivora</i> and Ultrastructural Changes of Its Neurosecretory Cells
  • モンシロチョウ イショク ノウ ノ ヒカリ シュウキ カンジュセイ ト 2ガタ シンケイ ブンピ サイボウ ノ ヘンカ

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説明

Photoperiodic sensitivity of diapausing pupae and of the larval brains which were implanted in the decerebrated diapause pupae was investigated in Pieris rapae crucivora. Ultrastructural changes of the neurosecretory cells (NS-II cells) of implanted brains were also observed in order to explain the influence of photoperiod on these cells. After the insensitive stage of certain days, diapause pupae were able to respond to the long photoperiod, and begin the adult development without chilling. The implanted brain from a short-day larvae in the age of the 4th day of the 5th instar exhibited the sensitivity to the photoperiodic stimulation. When exposed to the long photoperiod, the brain brought on the adult development of host pupae and the brain itself showed signs of adult development in its appearance and in the ultrastructure of NS-II cells. In this case, it took about ten days for the short-day brain to be entrained by the long photoperiod. When exposed to the short photoperiod, the host continued diapause and the NS-II cells of the implanted brain resembled those of the diapausing pupa kept at low temperature in ultrastructural view, because they appeared to be in inactive stage of secretion.

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