Nucleolus formation in structurally reconstructed barley karyotypes with six satellite chromosomes

Autor: G. Künzel, Rigomar Rieger, M. Anastassova-Kristeva, H. Nicoloff
Rok vydání: 1977
Předmět:
Zdroj: Chromosoma. 62:111-117
ISSN: 1432-0886
0009-5915
DOI: 10.1007/bf00292633
Popis: 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.
Databáze: OpenAIRE
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