Nucleic Acids Research, 2000, Vol. 28, No. 13 2571-2576
© 2000 Oxford University Press
The complete nucleotide sequence of the mitochondrial genome of sugar beet (Beta vulgaris L.) reveals a novel gene for tRNACys(GCA)
Laboratory of Genetic Engineering, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan
We determined the complete nucleotide sequence of the mitochondrial genome of an angiosperm, sugar beet (Beta vulgaris cv TK81-O). The 368 799 bp genome contains 29 protein, five rRNA and 25 tRNA genes, most of which are also shared by the mitochondrial genome of Arabidopsis thaliana, the only other completely sequenced angiosperm mitochondrial genome. However, four genes identified here (namely rps13, trnF-GAA, ccb577 and trnC2-GCA) are missing in Arabidopsis mitochondria. In addition, four genes found in Arabidopsis (ccb228, rpl2, rpl16 and trnY2-GUA) are entirely absent in sugar beet or present only in severely truncated form. Introns, duplicated sequences, additional reading frames and inserted foreign sequences (chloroplast, nuclear and plasmid DNA sequences) contribute significantly to the overall size of the sugar beet mitochondrial genome. Nevertheless, 55.6% of the genome has no obvious features of information. We identified a novel tRNACys gene (trnC2-GCA) which shows no sequence homology with any tRNACys genes reported so far in higher plants. Intriguingly, this tRNA gene is actually transcribed into a mature tRNA, whereas the native tRNACys gene (trnC1-GCA) is most likely a pseudogene.
* To whom correspondence should be addressed. Tel: +81 11 706 2806; Fax: +81 11 716 0879; Email: gelab@abs.agr.hokudai.ac.jp
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