RELATIONSHIP BETWEEN NUCLEO‐CYTOPLASMIC RATIO AND FINAL CELL VOLUME IN MICRASTERIAS CRUX‐MELITENSIS (DESMIDIACEAE, CHLOROPHYTA)1

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Abstract
In Micrasterias crux‐melitensis (Ehrbg.) Hass., small parental half‐cells produced daughter half‐cells larger than themselves. As the volume of the parental half‐cells decreased, the volume ratio of daughter to parental half‐cells increased; the larger the nucleo‐cytoplasmic ratio of parental half‐cells, the larger the volume of the daughter half‐cells. Small daughter half‐cells grew larger than expected when cytoplasm of other cells was incorporated. The number of dictyosomes was almost the same for cells of different volumes. Results obtained seem to suggest that the volume of daughter cells is determined by the balance between the gradient of mRNA and the quantity of cytoplasm.