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DISTRIBUTION AND TRANSCRIPTION ACTIVITY OF NUCLEOLAR DNA IN HIGHER PLANT CELLS
Author(s) -
Tao W.,
Xu W.,
Valdivia M. M.,
Hao S.,
Zhai Z. H.
Publication year - 2001
Publication title -
cell biology international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.932
H-Index - 77
eISSN - 1095-8355
pISSN - 1065-6995
DOI - 10.1006/cbir.2001.0791
Subject(s) - nucleolus , transcription (linguistics) , dna , microbiology and biotechnology , rna , rna polymerase i , transcriptional activity , gene , chemistry , transcription factor , biology , rna polymerase , biochemistry , linguistics , philosophy , cytoplasm
By using the NAMA‐Ur DNA selective staining method, we have observed in situ the location of nucleolar DNA in onion cells and found it at the boundary between fibrillar centres (FC) and dense fibrillar component (DFC) in transcriptionally active nucleolus. We have also used anti‐NOR serum, which is identified as the RNA Polymerase I transcription factor (UBF) antibody, to study its reactivity with higher plant cells and demonstrated this factor associated to the DFC but not present at the interior of FC. Finally, by employing anti‐DNA/RNA hybrid antibodies, we labeled the transcriptionally active rRNA genes in active nucleolus and testified that at the boundary between FC and DFC. The results provide the evidence that the boundary between FC and DFC is the genuine transcription site of rRNA genes in nucleolus.