Mitochondrial DNA (mtDNA) is known to encode the distinctive ribosomal RNA (rRNA) species found in the organelle-specific ribosomes that function in mitochondrial protein synthesis [1]. Qualitatively and quantitatively, rRNA production is a major genetic function of mtDNA, and the factors controlling mitochondrial rRNA (mt-rRNA) synthesis are therefore of great interest. Moreover, since homologous rRNA species are found in all systems (eukaryotic cytosol, prokaryotic, chloroplast, mitochondrial) having a ribosome-based translation system, comparative studies of these rRNAs and their genes are an important means of illuminating the evolutionary history of the eukaryotic cell and its organelles [2]. For these reasons, we have been investigating the organization and evolution of the rRNA genes in plant mitochondria, particularly those of wheat, Triticum aestivum.
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