Abstract
THE duration of the mitotic cycle in comparable tissues of different plant species is closely correlated with the amount of nuclear DNA1,2. In a survey of seven species Van't Hof2 showed that the average duration of the mitotic cycle in root tip meristems increases at the rate of 0.3 h/pg of DNA. Our own data agree in general with these results, but we have found certain exceptions. For example, where the increase in DNA is brought about by the addition of B chromosomes the duration of mitotis is increased to a disproportionate extent3. We have also found an unexpected difference in the relation between nuclear DNA and the duration of mitosis in monocotyledons as compared with dicotyledons.
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References
Van't Hof, J., and Sparrow, A. H., Proc. US Nat. Acad. Sci., 49, 897 (1963).
Van't Hof, J., Exp. Cell. Res., 39, 48 (1965).
Ayonoadu, U. A. U., and Rees, H., Exp. Cell. Res., 52, 285 (1968).
Wimber, D. E., Amer. J. of Bot., 47, 828 (1960).
Evans, H. J., and Scott, D., Genetics, 49, 17 (1964).
Quastler, H., and Sherman, F. G., Exp. Cell. Res., 17, 420 (1959).
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EVANS, G., REES, H. Mitotic Cycles in Dicotyledons and Monocotyledons. Nature 233, 350–351 (1971). https://doi.org/10.1038/233350a0
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DOI: https://doi.org/10.1038/233350a0
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