Processes of Reversion from Homopolar Doublets to Singlets in Paramecium bursaria(Cell Biology)

概要

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Morphological changes in the reversion process from the double-form cell (doublet) to the single-form cell (singlet) in an unicellular organism Paramecium bursaria was investigated. Though, in the life of doublets, there was a "meta-stable" period in which they produced doublet-type daughter cells, they soon failed to retain their doublet-state and eventually produced singlet duaghter cells. In the course of the reversion process, two kinds of aberrant shaped doublets were found: one was the N-cell with a notch at their anterior tip, and another was the P-cell which appeared to be pinched at the anterior portion. Isolation culture experiments of successively dividing cells showed that the P-cell gave rise to the N-cell, and that the N-cell produced a pair of singlets within subsequent several cell divisions. The notch was retained and deepened only in the daughter cell derived from the anterior part of the parental cell in each cell division. When the notch deepened more than 1/2 of the cell length, a pair of singlets were produced in the next division. Two oral apparatuses kept approximately 180° apart symmetric location throughout the reversion processe. Thus the process of reversion from doublet to singlet in P. bursaria is different from that of P. tetraurelia.
社団法人日本動物学会の論文
1991-02-15