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Nucleolar-organiser polymorphism in natural populations of Allium schoenopmsum

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Abstract

Allium schoenoprasum, 2n=16, has a single pair of highly acrocentric chromosomes which always have nucleolar-organiser regions on the short arms. In some British populations one or both homologues of submetacentric chromosome 7 may also carry a nucleolar-organiser region terminal on the long arm. These supernumerary satellites are simply inherited. Of the 13 populations examined, six were polymorphic for chromosome 7s. The frequency of chromosome 7s ranges from 0.130 to 0.825 and the distribution of the three karyotypes in all these populations corresponds to a HardyWeinberg equilibrium.

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Author notes

  1. Susan M. Bougourd

    Present address: Department of Cytogenetics, Charles Hayward Research Building, Queen Elisabeth Hospital for Children, Hackney Road, E2 8PS, London, England

Authors and Affiliations

  1. Department of Plant Biology and Microbiology, Queen Mary College, Mile End Road, E1 4NS, London, England

    Susan M. Bougourd & J. S. Parker

Authors
  1. Susan M. Bougourd
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  2. J. S. Parker
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Bougourd, S.M., Parker, J.S. Nucleolar-organiser polymorphism in natural populations of Allium schoenopmsum . Chromosoma 56, 301–307 (1976). https://doi.org/10.1007/BF00293193

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  • DOI: https://doi.org/10.1007/BF00293193

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