The formation of heterochromatin at ribosomal DNA, characterized by the modified histone H3K9me3. [ http://www.ncbi.nlm.nih.gov/pubmed/10219245 ]
Synonyms: rDNA heterochromatin assembly
Term information
heterochromatic silencing at rDNA
chromatin silencing at ribosomal DNA
rDNA chromatin silencing
https://github.com/geneontology/go-ontology/issues/23553
https://github.com/geneontology/go-ontology/issues/19238