Abstract
The length of the cell cycle was measured in the shoot apical meristem ofSilene coeli-rosa during the first day of an inductive photoperiod. The length of the cell cycle in the shoot apex of vegetative controls (those in short days) was about 18–20 hours. Exposure of plants to the long day resulted in an immediate shortening of the cell cycle to about 13 hours, roughly two thirds of that in short days. Measurements of the component phases of the cell cycle revealed that the shortened cycle in long days was the result of a decrease in the length of G 1 and perhaps S, whilst G 2 and M remained constant.
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