Abstract
According ti Richter's experiments we found, that under “normal” conditions after removal of the nucleus, Acetabularia are no longer able to increase substantially their RNA-content. But removing the nucleus of such plants which have been kept in darkness for ten days does not abolish the ability of RNA-net-synthesis. The extent of incorporation of [ 32P]orthophosphate into the nucleotides of RNA is indicating that de novo-synthesis of RNA takes place. The following conclusions have been drawn: 1. 1. Cytoplasma is able to synthesize RNA. This ability has been demonstrated in anucleate cells. 2. 2. Cytoplasmic RNA-synthesis is nucleus-dependent. Substances promoting cytoplasmic RNA-synthesis are probably delivered by the nucleus. These substances are accumulated in the cytoplasma of nucleate plants during darkness and consumed at light.
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