Biopolym. Cell. 1988; 4(2):101-104.
Genome and Its Regulation
Structural organization of ribosomal DNA in Atropa belladonna
1Borisyuk N. V., 2Miroshnichenko G. P.
  1. N. G. Kholodny Institute of Botany, Academy of Sciences of the Ukrainian SSR
    Kiev, USSR
  2. M. V. Lomonosov State University
    Moscow, USSR


The rDNA structure of A. belladonna was examined by Southern blot-hybridization of EcoRl- and EcoRV-digests of total nuclear DNA using the maize 32P-rRNA-probes and the 32P-pUC222 plasmid containing the sequence coding for the 3' end of 25S rRNA and a fragment of non-transcribing spacer from the lemon rDNA. The possible physical maps were tentatively constructed for EcoRl and EcoRV cleavage sites around the 18S and 25S rRNA genes. Two size classes of the repeating units of 9.4 and 10.2 kilobases were found containing the EcoRl cleavage sites in the coding regions for 18S and 25S rRNAs. Both the repeating units found contained only one EcoRV cleavage site.


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