Abstract
Abstract A ‘rejuvenated’ cell line of Colpoda cucullus was yielded from an aged culture submitted to a long‐term resting encystment, and was examined ultrastructurally in logarithmic growth phase and reproductive encystment, after recovery of the standard fission rate. In logarithmically growing cells, the macronuclear envelope shows deep invaginations with the appearance of inner ‘cytoplasmic isles’, and the nucleolar units loosely aggregate as in logarithmically growing young cells. On the other hand, new macronuclear features appear in the reproductive cysts, mainly because of the fusion of the nucleolar units. On the whole, the cytoplasm ultrastructure in rejuvenated cells appears not to differ remarkably from that of young cells. This study indicates that rejuvenated cells of C. cucullus show some ultrastructural aspects typical of young cells and others which are commonly observed in aged cells, and are probably derived from the previous senescent condition.
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