ニカメイチュウの幼虫休眠におけるホルモン支配

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  • The Hormonal Control of Larval Diapause in the Rice Stem Borer, <i>Chilo suppressalis</i>
  • ニカメイチュウ ノ ヨウチュウ キュウミン ニ オケル ホルモン シハイ エイブン 3
  • III. Histological Studies on the Neurosecretory Cells of the Brain and the Secretory Cells of the Corpora Allata during Diapause and Post Diapause
  • III. 休眠期および後休眠期における脳の神経分泌細胞およびアラタ体の分泌細胞に関する組織学的研究

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The neurosecretory cells of the brain and the secretory cells of the corpora allata in the rice stem borer have been investigated histologically through diapause and post diapause.<br>The neurosecretory cells of the brain consist of three groups in each half of the brain, medial, lateral and posterior groups. The posterior groups may be of new record in the brain of lepidopterous larvae. The medial group comprises two types of neurosecretory cells, A-cells and B-cells.<br>The histological appearance of the B-cell changes remarkably with the progress of diapause break, i.e., the B-cell looks like inactive during diapause period and becomes active towards the termination of diapause. The other neurosecretory cells did not show any significant change during that period.<br>Judging from the histological appearance as well as the volume changes of the corpus cardiacum and corpus allatum complex the corpus allatum seems to show high activity during diapause and to lose its activity gradually towards the pupation.<br>It may be noteworthy that there is a close relation between activities of the corpora allata cells and the B-cells of the brain during diapause and post diapause.

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