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The gene for the alpha subunit of atpase a site of homologous recombination in plant mitochondrial dna also functions in somatic hybrid cells


The gene for the alpha subunit of atpase a site of homologous recombination in plant mitochondrial dna also functions in somatic hybrid cells



Theoretical and Applied Genetics 84(1-2): 33-38



ISSN/ISBN: 0040-5752

Segments of mitochondrial DNA (mtDNA) carrying the gene for the .alpha.-subunit of F1-ATPase (atpA) were detected by Southern hybridization with atpA from pea as probe. In the case of Nicotiana langsdorffii, we identified four fragments that are derived from combinations of two different 5' and two different 3' flanking regions of atpA. All four types share the coding region, suggesting that they result from homologous recombination in the coding region of atpA. By contrast, N. glauca generated only one analogous fragment, which indicated the existence of only a single type of atpA in N. glauca. In the case of somatic hybrids obtained by fusion between protoplasts from N. langsdorffii and N. glauca, analysis with EcoRI or HindIII detected three new fragments in addition to the parental fragments. These new fragments can be explained by homologous recombination within the coding region of atpA. Our results show that the coding region of atpA is involved not only in intragenomic homologous recombination but can also be involved in homologous recombination between two parental mitochondrial genomes of somatic hybrids.

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Accession: 007902871

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Related references

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