Abstract
The sequences of the Internal Transcribed Spacer regions (ITS1 and ITS2) within the genes coding for cytoplasmic ribosomal (r) RNAs on the A chromosome complement of 34 members of the higher plant genus Brachycome (synonym Brachyscome) have been compared. The ITS1 sequence of species within the B. lineariloba complex contains a 56 bp tract that is absent from at least 12 Brachycome species but is present in other species within Brachycome as well as other Asteraceae. Phylogenetic data support the suggestion that the number of chromosomes reduced in several independent Brachycome lineages during speciation. Comparisons with the B chromosome ITS2 of B. dichromosomatica cytodeme A1 suggests an origin of the B chromosome at a time prior to the divergence of the four cytodemes of B. dichromosomatica.
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Field, B.L., Houben, A., Timmis, J.N. et al. Internal transcribed spacer sequence analyses indicate cytoevolutionary patterns within Brachycome Cass. (Asteraceae). Plant Syst. Evol. 259, 39–51 (2006). https://doi.org/10.1007/s00606-005-0400-y
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DOI: https://doi.org/10.1007/s00606-005-0400-y