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.
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Houben, A., Thompson, N., Ahne, R. et al. A monophyletic origin of the B chromosomes ofBrachycome dichromosomatica (Asteraceae). Pl Syst Evol 219, 127–135 (1999). https://doi.org/10.1007/BF01090304
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DOI: https://doi.org/10.1007/BF01090304