Stylonychiaの分裂時におけるキネトソーム

概要

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At each base of 8 frontal, 5 ventral and 5 anal cirri on the ventral surface of Stylonychia histrio Mull there develops one macrokinetosome at interfissional stage. At earlier stage (migration stage of the reorganization band in each of two macronuclei), from the macrokinetosomes there develop the groups of mikrokinetosomes, by whose multiplication granular streamings are formed, especially from macrokinetosomes of 5 frontal cirri (except 3 frontal one at the anterior end of the body), and of 5 ventral cirri, which gradually shorten their length and finally disappear. Thereafter, the assembly of each streaming occurs at the inner side of anterior and posterior membranelles respectively. At middle stage (fusion stage of two macronuclei), all of the remaining 3 frontal and 5 anal cirri grow shorter and their macrokinetosomes change into the groups of microkinetosomes, each of which adhere partly to the above mentioned granular assemblies. At later stage (1st and 2nd amitotic divisionso of a fused macronucleus), the granular assemblies are constricted into a definite number of smaller masses, which disperse along the inner areas of two renewed membranelles, and then they grow into two sets of the primordia of cirri so as to be arranged on the daughter animals. Such morphogenetic processes are found even in the starved animals and resemble generally to those seen in the dividing ones.
社団法人日本動物学会の論文
1957-01-15