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Abstract
Two structurally reconstructed karyotypes of Hordeum vulgare which, due to appropriate reciprocal translocations, contain three chromosome pairs with nucleolus organizing activity (chromosomes 57, 6 and 77 in translocation line T 21, chromosomes 36, 63, and 7 in translocation line T 627) have been studied with respect to the position and function of rDNA as inferrred from the pattern of nucleolus formation. The results obtained reveal quantitative relationships between the size of the secondary constriction (the amount of rRNA cistrons) and the number and size of nucleoli being formed. Quantitative and qualitative aspects of rDNA location and expression are being discussed.
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