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      Evolution and function of B chromosome 45S rDNA sequences in Brachycome dichromosomatica.

      Genome / National Research Council Canada = Génome / Conseil national de recherches Canada
      Asteraceae, classification, genetics, Base Sequence, Cell Nucleolus, metabolism, Chromosomes, Plant, DNA, Ribosomal, chemistry, Evolution, Molecular, In Situ Hybridization, Fluorescence, Molecular Sequence Data, Phylogeny, Plant Leaves, RNA, Ribosomal, Transcription, Genetic

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          Abstract

          The origin and activity of 45S rDNA located on micro B chromosomes of the daisy Brachycome dichromosomatica were analysed. The internal transcribed spacer 2 (ITS2) of the 45S rRNA gene was sequenced for micro B, large B, and A chromosomes of B. dichromosomatica cytodeme A2, and conserved differences were identified between sequences originating from A and both types of B chromosomes. Phylogenetic analysis did not identify a species containing an ITS2 sequence more similar to either of the B chromosome sequences than the B. dichromosomatica A chromosome sequences. Thus, an origin of the B chromosomes from A chromosomes at a time prior to the divergence of the 4 cytodemes of B. dichromosomatica is suggested. The frequent (70%) nucleolar non-association of micro B chromosomes suggests inactivity of micro B 45S rDNA.

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