Abstract
Intraspecific variability of rDNA content in two cultivars of Allium cepa and in a strain of Allium sativum (U type) was studied by filter hybridization of 3H-rRNA with DNA extracted from roots of individual bulbs. The range of variation in% hybrid values was 2-fold (0.052% to 0.106%) and 2.5-fold (0.049% to 0.124%) in the two Allium cepa cultivars, but it was much smaller (0.048% to 0.061%) in the Allium sativum strain. — In both Allium cepa cultivars studied plants were observed carrying two, three or four nucleolus organizers per cell; cytological polymorphism of the nucleolus organizer regions was demonstrated by Giemsa C-banding. The number of ribosomal cistrons per genome of the bulb does not seem to be strictly dependent upon the number of nucleolus organizers per cell, and no relationship was detected between Giemsa banding pattern of nucleolar chromosomes and rDNA content of the bulb.
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