Formation of Egg Adhesive Material in Masked Greenling, Hexagrammos octogrammus.
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概要
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Formation of the vitelline envelope of the masked greenling was investigated by electron microscopy to clarify the origin of adhesive material on the chorion. In developing oocytes the envelope had three zones, referred to as Z1 (outermost), Z2 and Z3 . Z1 and Z2 first appeared during the pre-vitellogenic stage. Z1 consisted of a low electron-dense substance accumulated in the space between Z2 an electron-dense substance deposited on the oocyte surface and the granulosa cells. During this stage, well developed endoplasmic reticula and Golgi apparati occurred in the granulosa cells. Numerous small vesicles in the granulosa cell fused with the plasma membrane facing the oocyte. Therefore, it is plausible that the granulosa cell synthesizes and secrets some material for Z1, which formed continuously until the vitellogenic stage, when formation of Z3 occurred. In pre-ovulatory follicles, the structure of Z1 changed greatly, the major portion of its constituents diffusing into the wide intercellular spaces between the granulosa cells. The remaining portion of Z1 was transformed into fine coagulative particles forming a thin, down-like layer. In ovulated eggs, a transparent layer appearing on the outside of the down-like layer was considered to have formed from the diffused portion of the Z1 components, which coagulated and then swelled by absorbing ovarian fluid. The transparent layer disappeared after the egg was immersed in seawater, allowing the exposed, down-like layer to adhere directly to adjacent eggs.
- 日本魚類学会の論文
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