ウニの卵割面に於ける粘液物質の分泌

概要

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In 1935, the writer suggested that the cell boundary between the blastomeres in the sea urchin egg is newly produced in the course of cleavage. The present paper deals with a mechanism for the formation of the new cell boundary of daughter blastomeres in the egg of the sea urchin, Hemicentrotus pulcherrimus. Developing eggs in various cleavage stages were stained supravitally with a dilute solution of Alcian blue for 20 to 30 minutes. At the beginning of cleavage, a streak of darkly stained substance appeared at the furrow region. Under high magnification, the stained streak was observed to be a row of minute particles measuring about 0.5μ in diameter. As the furrowing advanced, the stained particles gradually increased in number at the furrow region, and later formed a belt of stained particles. In the deep part, the stained particles were also observed near the furrow. At the four cell stage, the stained material accumulated at the central part of the four daughter cells. Namely, the material stained with Alcian blue entered the future segmentation cavity. The present observation shows that the secretion of the mucosubstance at the furrow region causes the splitting of the daughter blastomeres.
社団法人日本動物学会の論文
1966-07-15