ニカメイガの越冬幼虫における生殖巣の発育とアラタ体の大きさの変化ならびに後休眠期間の長さとの関係

DOI Web Site

書誌事項

タイトル別名
  • Relations with Development of the Gonads, Dimensional Changes of the Corpora Allata, and Duration of Post-diapause Period in Hibernating Larvae of the Rice Stem Borer
  • ニカメイガ ノ エットウ ヨウチュウ ニ オケル セイショク ソウ ノ ハツイク ト アラタタイ ノ オオキサ ノ ヘンカ ナラビニ アト キュウミン キカン ノ ナガサ ト ノ カンケイ エイブン

この論文をさがす

抄録

1. In the spermatogenesis of the rice stem borer, it can be most easily judged from the changes in the external form of cyst without staining whether the meiosis has finished in male sex-cells.<br>2. It is also confirmed in this paper that the gonads of the larva remain in a definite size till a certain time of the hibernating period and grow in size coinciding with the inner histological development even after, as already shown by the previous workers. That is, even the most developed sex-cells in the male larva in diapause remain in the stage just before the meiosis takes place during a considerable period. These facts are not, however, recognized in the male larva in non-diapause. On the other hand, on the female larva in diapause, it is impossible to distinguish between oocyte and nurse cell.<br>3. The change in size of the corpus cardiarum and corpus allatum complex in the hibernating male larva synchronizes approximately simultaneously with that in the female.<br>4. The gonads of the hibernating larvae begin to develop, as the corpus cardiacum and corpus allatum complex begins to decrease in size.<br>5. Judging from the results obtained in these experiments and the fact that the reduction of the activity in the corpus allatum; the decrease in size of the complex, connects closely with the diapause break, the diapause break may be determined easily by observing. the gonads; size of the testis or external form of cyst in the male larva and external form of the ovaries in the female. However, the termination of diapause can be decided most easily by judging from the changes in the external form of cyst whether the meiosis has finished, or not.<br>6. The total effective temperatures during the post-diapause period are 273 day degrees in the male larva and 286 day degrees in the female on the average, respectively.

収録刊行物

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ