Similar replicon properties of higher plant cells with different S periods and genome sizes |
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Authors: | J Van't Hof C A Bjerknes |
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Institution: | Biology Department, Brookhaven National Laboratory, Upton, NY 11973, USA |
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Abstract: | Root meristematic cells of nine unrelated diploid higher plants with genome sizes that differ 82-fold and with S periods that differ 4-fold have similar replicon sizes and single replication fork rates that average 22 μm and 8 μm/h respectively. The average replicon size of 22 μm is near the 18 μm obtained by extrapolation of measurements, taken from DNA fiber autoradiograms, to zero pulse time with 3H]thymidine. The data suggest that the duration of S is determined by the minimal number of replicon families that function sequentially during DNA replication. |
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