Abstract
DNA of Chara vulgaris thalli contains target sequences for the methylation-sensitive restriction enzymes, Sau3A, HpaII and MspI. These enzymes were used with the in situ nick-translation radioactive technique to evaluate by grain counting in autoradiograms changes in cytosine methylation during antheridial filament development and spermiogenesis. In successive generations of dividing antheridial filaments the level of DNA methylation gradually increases, then decreases slightly in the early stages of spermiogenesis. Spermatozoids display the highest level of DNA methylation.
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