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Extensive homologous chloroplast DNA recombination in the pt14 Nicotiana somatic hybrid

Summary

In a previous study, six recombination sites have been confirmed in the chloroplast DNA (cpDNA) of pt14, a somatic hybrid of Nicotiana tabacum and Nicotiana plumbaginifolia. In the present study, physical mapping revealed six recombination sites in the 11.4-kb SalI fragment alone, only one of which has been previously identified. This fragment is located in the large unique region. We assume, therefore, that the pt14 cpDNA is a fine mosaic of the parental genomes with a recombination site about every 2 kb. A 748-bp region that comprised the intergenic region between ORF73 and ORF74B, and 460 bp of the petD intron have been sequenced. Parent-specific sequences in the pt14 DNA defined the regions within which recombination took place. The exact site of recombination events could not be determined because the parental sequences were identical between the polymorphic markers, and these sequences have been preserved in the pt14 line.

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Communicated by G. Wenzel

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Fejes, E., Engler, D. & Maliga, P. Extensive homologous chloroplast DNA recombination in the pt14 Nicotiana somatic hybrid. Theoret. Appl. Genetics 79, 28–32 (1990). https://doi.org/10.1007/BF00223782

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Key words

  • Chloroplast DNA
  • Homologous recombination
  • Nicotiana