両生類の卵形成過程の研究 : V.ヤマアカガエルのタンパク卵黄形成

概要

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Electron microscopic studies have shown that there is a dual mechanism for the formation of proteinaceous yolk in oocytes of Rana ornativentris as in those of other species of the same genus. In the first mode of formation, electron dense yolk bodies appear and grow within the vesicular structures enclosing varying amounts of granular and fibrillar components. In the second mode of formation, plate-like crystalline yolk bodies of a diameter not exceeding that of mitochondria and a height of about 25 mμ surrounded by pyramidal faces originate within the cristae of mitochondria. The proteinaceous yolk of this type grows within the cristae by piling up of individual plate-like crystalline bodies in the direction of long axis of mitochondrion, so that the profile of yolk body as a whole show regular indentations. In young oocytes, there exist numerous vesicular chains distributed in all directions through the ooplasm. The same crystalline yolk bodies as those lying within the cristae of the mitochondria are often found to be formed precociously even in the single membrane vesicles which are associated with the vesicular chains. These findings support the idea that the single membrane vesicles are an intermediate form in the course of mitochondrial formation from vesicular chains.
社団法人日本動物学会の論文
1967-08-15