Sex differentiation of germ cells in the teleost, Oryzias latipes, during noraml embryonic development.
Sex differentiation of germ cells in the teleost, Oryzias latipes, during noraml embryonic development.
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发表时间：
1972-10
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通讯作者：
N. Satoh;N. Egami
中科院分区：
文献类型：
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作者：
N. Satoh;N. Egami
本报告研究了稻科植物生殖细胞在早期发育过程中的有丝分裂和减数分裂活动。原始生殖细胞在受精后第3天与体细胞有明显区别，在受精后第7天左右开始增殖。在受精后的7-10天内，原始生殖细胞的平均数量增加，在孵化前达到90个左右。根据生殖腺雏形中生殖细胞的数量和核活性，可将新孵化的鱼苗分为两类。一种是含有约100个生殖细胞的苗，在减数分裂前期没有细胞。在另一种类型的油炸中，生殖细胞的数量随着有丝分裂而增加，一些细胞开始进入减数分裂前期。在进一步发育过程中，前者分化为雄性，后者分化为雌性。因此，生殖细胞的形态性别分化发生在孵化时。然而，性腺中体细胞成分的组织学结构在当时没有观察到性别差异。
Mitotic and meiotic activities of germ cells during early development in the medaka, Oryzias latipes, are dealt with in this report. Primordial germ cells were obviously distinguishable from somatic cells 3 days after fertilization and began to proliferate about 7 days after fertilization. The mean number of primordial germ cells increased during a period of 7–10 days after fertilization, reaching about 90 immediately before hatching. Newly hatched fry could be classified into two types according to the number and the nucleic activity of germ cells in the gonadal rudiment. One type consisted of fry containing about 100 germ cells and no cells in the meiotic prophase. In the other type of fry the number of germ cells increased by mitotic divisions and some of the cells began to enter into the meiotic prophase. During the course of further development the fry of the former type differentiated into males and the latter into females. Therefore it can be concluded that the morphological sex differentiation of germ cells occurs at the time of hatching. However, no sexual differences in the histological structure of somatic elements in the gonad are observable at that time.