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‘Nucleolar dominance’ as observed in barley translocation lines with specifically reconstructed SAT chromosomes

Theoretical and Applied Genetics volume 55, pages 247–251 (1979)Cite this article

Summary

Diploid homo- and heterokaryotypes of barley translocation lines with only one satellite chromosome pair containing two nucleolus organizer regions (NORs) in opposite arms were found to show repressed nucleolus formation by the transposed NOR as evident from the formation of only micronucleoli. The same was true for auto-tetraploid homokaryotypes and for translocation lines with all NORs tandemly arranged into the same chromosome arm. When NORs were transposed to chromosomes without NOR in the standard karyotype, the normal pattern of nucleolus formation remained unaffected. The modified mode of nucleolus formation after the combination of all NORs in one chromosome pair is interpreted to be due to intrachromosomal nucleolar dominance analogous to interchromosomal nucleolar dominance observed in certain interspecific hybrids.

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Affiliations

  1. Institute of Genetics, Academy of Sciences, Sofia, Bulgaria

    H. Nicoloff

  2. Academy of Sciences, Institute of Morphology, Sofia, Bulgaria

    M. Anastassova-Kristeva

  3. Zentralinstitut für Genetik und Kulturpflanzenforschung der Akademie der Wissenschaften der DDR, Gatersleben, DDR

    R. Rieger & G. Künzel

Authors
  1. H. Nicoloff
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  2. M. Anastassova-Kristeva
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  3. R. Rieger
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  4. G. Künzel
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Communicated by H.F. Linskens

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Nicoloff, H., Anastassova-Kristeva, M., Rieger, R. et al. ‘Nucleolar dominance’ as observed in barley translocation lines with specifically reconstructed SAT chromosomes. Theoret. Appl. Genetics 55, 247–251 (1979). https://doi.org/10.1007/BF00265358

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  • DOI: https://doi.org/10.1007/BF00265358

Key words

  • Nucleolar dominance
  • Translocation lines
  • Nucleolus
  • Nucleolus association
  • Barley