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Plant Systematics and Evolution

, Volume 219, Issue 1–2, pp 127–135 | Cite as

A monophyletic origin of the B chromosomes ofBrachycome dichromosomatica (Asteraceae)

  • Andreas Houben
  • Nicole Thompson
  • Richard Ahne
  • Carolyn R. Leach
  • Dawn Verlin
  • Jeremy N. Timmis
Article

Abstract

The A and B chromosomes of different karyotype variants (cytodemes A1, A2, A3 and A4) ofBrachycome dichromosomatica were analysed by computer-aided chromosome image analysis and fluorescencein situ hybridisation (FISH). Ribosomal DNA and the B chromosome-specific sequence Bd49 were detected on all B chromosomes. In addition to minor size variation of the Bs, polymorphism of the rDNA and Bd49 position and copy number revealed two major types of B chromosomes. The B chromosomes of all the cytodemes were indistinguishable from each other in length, but that of A3 showed evidence of rearrangements consistent with its long-term geographic isolation. The results presented suggest a monophyletic origin of the B chromosomes ofB. dichromosomatica.

Key words

Asteraceae Brachycome B chromosome polymorphism evolution karyotyping centromere 

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Copyright information

© Springer-Verlag 1999

Authors and Affiliations

  • Andreas Houben
    • 1
  • Nicole Thompson
    • 2
  • Richard Ahne
    • 3
  • Carolyn R. Leach
    • 1
  • Dawn Verlin
    • 1
  • Jeremy N. Timmis
    • 1
  1. 1.Department of GeneticsThe University of AdelaideAustralia
  2. 2.Department of Crop ProtectionThe University of AdelaideGlen OsmondAustralia
  3. 3.Bundesanstalt für Züchtungsforschung an KulturpflanzenQuedlinburgGermany

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