Theoretical and Applied Genetics

, Volume 111, Issue 2, pp 196–205

Molecular cytogenetic analysis of Brassica rapa-Brassica oleracea var. alboglabra monosomic addition lines

  • Robert Hasterok
  • Elzbieta Wolny
  • Sylwia Kulak
  • Aleksandra Zdziechiewicz
  • Jolanta Maluszynska
  • Waheeb K. Heneen
Original Paper

DOI: 10.1007/s00122-005-1942-7

Cite this article as:
Hasterok, R., Wolny, E., Kulak, S. et al. Theor Appl Genet (2005) 111: 196. doi:10.1007/s00122-005-1942-7

Abstract

Interspecific alien chromosome addition lines can be very useful for gene mapping and studying chromosome homoeology between closely related species. In this study we demonstrate a simple but robust manner of identifying individual C-genome chromosomes (C5, C8 and C9) in the A-genome background through the simultaneous use of 5S and 25S ribosomal probes on mitotic and meiotic chromosomes of three different Brassica rapa-B. oleracea var. alboglabra monosomic addition lines. Sequential silver staining and fluorescence in situ hybridisation indicated that 18S-5.8S-25S rRNA genes on the additional chromosome C9 are expressed in the A-genome background. Meiotic behaviour of the additional chromosomes was studied in pollen mother cells at diakinesis and metaphase I. In all of the addition lines the alien chromosome was most frequently observed as a univalent. The alien chromosome C5, which carries an intercalary 5S rDNA locus, occasionally formed trivalents that involved either rDNA- or non rDNA-carrying chromosomes from the A genome. In the case of chromosomes C8 and C9, the most frequently observed intergenomic associations involved the regions occupied by 18S-5.8S-25S ribosomal RNA genes. It is possible that not all such associations represent true pairing but are remnants of nucleolar associations from the preceding interphase. Variations in the numbers and distribution of 5S and 25S rDNA sites between cultivars of B. oleracea, B. oleracea var. alboglabra and B. rapa are discussed.

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Robert Hasterok
    • 1
  • Elzbieta Wolny
    • 1
  • Sylwia Kulak
    • 1
  • Aleksandra Zdziechiewicz
    • 1
  • Jolanta Maluszynska
    • 1
  • Waheeb K. Heneen
    • 2
  1. 1.Department of Plant Anatomy and CytologyUniversity of SilesiaKatowicePoland
  2. 2.Department of Crop ScienceSwedish University of Agricultural SciencesAlnarpSweden

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