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Abstract
The average mitotic cycle duration of root meristem cells of several plants was measured with 3H-thymidine. The results were in full accord with the statement that the cycle duration increases with an increase in the DNA content per cell. The results also showed that the average mitotic cycle duration for root meristem cells is the sum of the duration of DNA synthesis (S period) and a constant of 5.25–6.5 hr. The S period duration and the average mitotic cycle duration increase linearly with either the amount of DNA per cell or the average rate of DNA synthesis. The average rate of DNA synthesis also increased with the amount of DNA to be replicated per cell per cycle.
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