Abstract
A labile fraction of DNA, part of which appears to have an association with the major stable DNA fraction of the cell, has been isolated from plant tissue. This labile DNA resembles that reported in peanut cotyledons (7), cucumber seedlings (8) and maize (9). Although autoradiography indicates that the majority of the DNA must be nuclear, this is not in conflict with the view that a labile cytoplasmic DNA fraction also exists since this could represent only a small fraction of the total cell DNA (10). In animal tissue evidence has been presented that DNA synthesis may be unrelated to cell division or polyploidy and where this is so then this DNA is metabolically labile (11). However, no rôle can be assigned to a labile DNA molecule within the framework of current concepts of cell regulatory processes.
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