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

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...

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Bibliographic Details
Published in:Plant systematics and evolution 1999-03, Vol.219 (1-2), p.127-135
Main Authors: Houben, Andreas, Thompson, Nicole, Ahne, Richard, Leach, Carolyn R., Verlin, Dawn, Timmis, Jeremy N.
Format: Article
Language:English
Subjects:
B chromosome
Chromosomes
Copy number
Deoxyribonucleic acid
DNA
Hybridization
Image analysis
Image processing
Karyotypes
Nucleotide sequence
Polymorphism
Ribosomal DNA
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Summary: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.
ISSN:0378-2697
1615-6110
2199-6881
DOI:10.1007/BF01090304