Abstract

Under our experimental conditions labelling of DNA in higher plants with 32P phosphate, 14C uridine and 14C thymidine shows two distinct species of labelled DNA: bulk-DNA and a satellite DNA. The bulk DNA (ϱ = 1.696 g.cm −3) does not incorporate 32P phosphate, but 14C thymidine. On the other hand the satellite-DNA (ϱ = 1.720 g.cm −3) does not incorporate 14C thymidine, but 32P phosphate. Both have 14C-Uridine as a precursor. An attempt has been made to establish the cellular localisation of these two DNA's.

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