rDNA site number polymorphism and NOR inactivation in natural populations ofAllium schoenoprasum (original) (raw)

Abstract

Nucleolar-organiser activity has been studied by silver staining and by_in situ_ hybridization with an rDNA probe in two populations of_Allium 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 of_A. schoenoprasum_.

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Authors and Affiliations

1. Departamento de Genetica, Facultad de Ciencias, Universidad de Granada, 18071, Granada, Spain
   M. A. Garrido, R. Lozano, C. Ruiz Rejon & M. Ruiz Rejon
2. Department of Botany, School of Plant Sciences, University of Reading, Whitenights, RG6 2AS, Reading, UK
   M. Jamilena & J. S. Parker

Authors

1. M. A. Garrido
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2. M. Jamilena
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3. R. Lozano
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4. C. Ruiz Rejon
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5. M. Ruiz Rejon
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6. J. S. Parker
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Garrido, M.A., Jamilena, M., Lozano, R. et al. rDNA site number polymorphism and NOR inactivation in natural populations of_Allium schoenoprasum_.Genetica 94, 67–71 (1994). https://doi.org/10.1007/BF01429221

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• Received: 30 December 1993
• Accepted: 06 January 1994
• Issue Date: February 1994
• DOI: https://doi.org/10.1007/BF01429221

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