Distribution of DNA and localization of rRNA transcription in G2 phase nucleolus of Physarum polycephalum

摘要

Using electron microscopy, NAMA-Ur DNA selective staining and BrUTP incorporation, the nucleo- lus ultrastructure, the distribution of DNA and the rRNA transcription sites in nucleolus of G2 phase Physarum poly- cephalum were studied. The nucleolus was found to be different fin structure from that of other plant cells. Fibrillarcen- ters (FCs) were present in a large amount all over the nucleolus.