The chloroplast trnP-trnW petG gene cluster in the mitochondrial genomes of Beta vulgaris, B. trigyna and B. webbiana: evolutionary aspects.
1995
Kubo T. | Yanai Y. | Kinoshita T. | Mikami T.
The chloroplast trnP-trnW-petG gene cluster has been identified in the mitochondrial DNA (mtDNA) of sugar beet (Beta vulgaris). The chloroplast-derived trnW gene is transcribed in the mitochondria; the other two genes, however, do not seem to be transcribed. This gene cluster is also present in the mitochondrial genomes of two wild Beta species, Beta trigyna and Beta webbiana. Sugar beet and the two wild relatives share 100% sequence identity in the coding regions of both the mitochondrial trnP and trnW genes. On the other hand, the petG genes from the wild Beta mtDNAs were found to be disrupted either by a 5-bp duplication (B. trigyna) or by a deletion of the 5' region (B. webbiana). A data-base search revealed that a conserved sequence of 60 bp is present in the trnP-trnW intergenic region of the mitochondrial genomes of the three Beta species as well as in other higher plants, including wheat and maize, and that the conserved sequence is absent from the chloroplast counterpart. The results thus favour the hypothesis of a monophyletic origin of the trnP-trnW-petG cluster found in the plant mitochondrial genomes examined.
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