ウスイタボヤの無性生殖相同調のメカニズムに関する研究

概要

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In some botryllid ascidians, it is well known that all zooids in the same colony has generated at the same time and developed at about the same speed. In order to analyze the mechanism of this synchronized development of the buds, we performed the following experiments. First series of experiments are isolation of a unit (a set of zooid, 1st buds and 2nd buds.) from the colony and removal of buds or zooids. Second series of experiments are fusion of two colonies in different phases of bud development. These results are as follows. 1. Buds grew up spontaneously to zooids, although these connective zooids had been removed. 2. The time when budding takes place was restricted in a given stage of the zooid development. 3. When two colonies in different phases of bud development were fused, these were synchronized after the mixture of blood. While, takeover or zooid death did not occur at the same time. 4. When a colony was fused with another one in different phase without both any zooids and any buds, its original phase was not affected. Therefore, it is suggested that functional zooids and or buds may play an important role in the progress of phases.
1998-03-31