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. 1984 Aug 10;12(15):6141–6157. doi: 10.1093/nar/12.15.6141

Recombination sequences in plant mitochondrial genomes: diversity and homologies to known mitochondrial genes.

D B Stern, J D Palmer
PMCID: PMC320063  PMID: 6473104

Abstract

Several plant mitochondrial genomes contain repeated sequences that are postulated to be sites of homologous intragenomic recombination (1-3). In this report, we have used filter hybridizations to investigate sequence relationships between the cloned mitochondrial DNA (mtDNA) recombination repeats from turnip, spinach and maize and total mtDNA isolated from thirteen species of angiosperms. We find that strong sequence homologies exist between the spinach and turnip recombination repeats and essentially all other mitochondrial genomes tested, whereas a major maize recombination repeat does not hybridize to any other mtDNA. The sequences homologous to the turnip repeat do not appear to function in recombination in any other genome, whereas the spinach repeat hybridizes to reiterated sequences within the mitochondrial genomes of wheat and two species of pokeweed that do appear to be sites of recombination. Thus, although intragenomic recombination is a widespread phenomenon in plant mitochondria, it appears that different sequences either serve as substrates for this function in different species, or else surround a relatively short common recombination site which does not cross-hybridize under our experimental conditions. Identified gene sequences from maize mtDNA were used in heterologous hybridizations to show that the repeated sequences implicated in recombination in turnip and spinach/pokeweed/wheat mitochondria include, or are closely linked to genes for subunit II of cytochrome c oxidase and 26S rRNA, respectively. Together with previous studies indicating that the 18S rRNA gene in wheat mtDNA is contained within a recombination repeat (3), these results imply an unexpectedly frequent association between recombination repeats and plant mitochondrial genes.

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Selected References

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