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Genetica

, Volume 94, Issue 1, pp 67–71 | Cite as

rDNA site number polymorphism and NOR inactivation in natural populations ofAllium schoenoprasum

  • M. A. Garrido
  • M. Jamilena
  • R. Lozano
  • C. Ruiz Rejon
  • M. Ruiz Rejon
  • J. S. Parker
Article

Abstract

Nucleolar-organiser activity has been studied by silver staining and byin situ hybridization with an rDNA probe in two populations ofAllium schoenoprasum. One population is monomorphic with NORs and rDNA sites terminal on the short arm of pair 8 in all individuals. The other populations is monomorphic for pair 8 NORs but is also polymorphic for NORs on the long arm of pair 7. All plants in this population carry ribosomal cistrons on both chromosomes of pair 7 but 0, 1 or 2 of these sites can be active in rRNA synthesis. Cis-acting nucleolar-suppression affects the pair 7 locus. We suggest that there has been progressive reduction in the number of NORs during the evolution ofA. schoenoprasum.

Keywords

Natural Population Silver Staining Progressive Reduction rDNA Site Site Number 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • M. A. Garrido
    • 1
  • M. Jamilena
    • 2
  • R. Lozano
    • 1
  • C. Ruiz Rejon
    • 1
  • M. Ruiz Rejon
    • 1
  • J. S. Parker
    • 2
  1. 1.Departamento de Genetica, Facultad de CienciasUniversidad de GranadaGranadaSpain
  2. 2.Department of Botany, School of Plant SciencesUniversity of ReadingReadingUK

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