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Mitochondrial Genome Recombination in Somatic Hybrids of Solanum commersonii and S. tuberosum
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  • Kwang-Soo Cho,
  • Hyun-Oh Lee,
  • Sang-Choon Lee,
  • Hyun-Jin Park,
  • Jin-Hee Seo,
  • Ji-Hong Cho,
  • Young-Eun Park,
  • Jang-Gyu Choi,
  • Tae-Jin Yang
Kwang-Soo Cho
National Institute of Crop Science Department of Southern Area

Corresponding Author:[email protected]

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Hyun-Oh Lee
Seoul National University
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Sang-Choon Lee
Phyzen
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Hyun-Jin Park
Highland Agriculture Research Institute, National Institute of Crop Science
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Jin-Hee Seo
Highland Agriculture Research Institute, National Institute of Crop Science
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Ji-Hong Cho
Highland Agriculture Research Institute, National Institute of Crop Science
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Young-Eun Park
Highland Agriculture Research Institute, National Institute of Crop Science
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Jang-Gyu Choi
Highland Agriculture Research Institute, National Institute of Crop Science
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Tae-Jin Yang
Seoul National University
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Abstract

Interspecific somatic hybridization has been performed in potato breeding experiments to increase plant resistance against biotic and abiotic stress conditions. We analyzed the mitochondrial and plastid genomes and 45S nuclear ribosomal DNA (45S rDNA) for the cultivated potato (S. tuberosum, St), wild potato (S. commersonii, Sc), and their somatic hybrid (StSc). Complex genome components and structure, such as the hybrid form of 45S rDNA in StSc, unique plastome in Sc, and recombinant mitogenome were identified. However, the mitogenome exhibited dynamic multipartite structures in both species as well as in the somatic hybrid. In St, the mitogenome is 756,058 bp and is composed of five subgenomes ranging from 297,014 to 49,171 bp in St. In Sc, it is 552,103 bp long and is composed of two sub-genomes of 338,427 and 213,676 bp length. StSc has 447,645 bp long mitogenome with two subgenomes of length 398,439 and 49,206 bp. The mitogenome structure exhibited dynamic recombination mediated by tandem repeats; however, it contained highly conserved genes in the three species. Among the 35 protein-coding genes of the StSc mitogenome, 21 were identical for all the three species, and 12 and 2 were unique in Sc and St, respectively. The recombinant mitogenome might be derived from homologous recombination between both species during somatic hybrid development.