ハサミムシAnisolabis maritima Bonelliの卵巣成熟機構に關する二三の實驗
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概要
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In order to study the possible relation between the ovaries and the corpora allata of the earwig, Anisolabis maritima Bonelli, the following experiments wee performed: (1) the allatectomy, (2) the implantation of the corpora allata in the allatectomized individuals, and (3) the transection of the recurrent nerve at the level just anterior or posterior to the corpora allata. The ovaries were observed 5〜40 days after operation. In March and April, before the breeding season of the insect, neither follicular maturation nor yolk-deposition in the egg cells were observed at 30〜40 days after allatectomy. In the controls, either traumatized or intact, follicular maturation and yolk-deposition in the egg cells advanced at some length, especially larger animals. In the breeding season, from March to July, the ovaries of many of the allatectomized insects remained undeveloped. But if the ovaries had already contained large yolk-laden eggs at the operation they degenerated afterwards and were rosorbed. Fully matured, yolk-laden eggs, if present at the allatectomy, were layed inspite of the absence of the corpora allata. In the allatectomized animals with the implants of the corpora allata and those with the recurrent nerve transected at the level just posterior to the corpora allata follicular maturation was slightly affected but in those which had matured eggs in their ovaries at the operations could lay them normally. In September, after the breeding season, follicular maturation could be indeced in 10 to 15 days by incubating the female insects at 25℃.But in the insects, either allatectomized or with the recurrent nerves cut before the corpora allata, follicular maturation never occurred, although the animals were kept at 25℃. The implantation of the corpora allata promoted follicular growth in the incubated allatectomized ones. If the recurrent nerves were cut at the level posterior to the corpora allata, follicular maturation was strikingly accelerated in the incubated females, and fully matured, yolk-laden eggs wee produced. It may be concluded from these results that in the breeding season the brain stimulates the corpora allata to secrete ovary-stimulating hormone but in the sexually inactive seasons it inhibits follicular maturation through the recurrent nerve. Under the influence of the external factors, especially the change of temperature, of the breeding season, the hormone of the corpora allata may stimulate follicular growth and at the same time the inhibitory impulse from the brain to the ovary may be attenuated.
- 社団法人日本動物学会の論文
- 1949-12-15