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Chloroplast and mitochondrial DNA composition of triploid and tetraploid somatic hybrids between Lycopersicon esculentum and Solanum tuberosum

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Abstract

The chloroplast (cp) DNA type and mitochondrial (mt) DNA composition of 17 somatic hybrids between a cytoplasmic albino tomato and monoploid potato (A7-hybrids) and 18 somatic hybrids between a nitrate reductase-deficient tomato and monoploid potato (C7-hybrids) were analyzed. Thirteen A7-hybrids and 9 C7-hybrids were triploids (with one potato genome); the other hybrids were tetraploid. As expected, all A7-hybrids contained potato cpDNA. Of the C7-hybrids 7 had tomato cpDNA, 10 had potato cpDNA and 1 hybrid contained both tomato and potato cpDNA. The mtDNA composition of the hybrids was analyzed by hybridization of Southern blots with four mtDNA-specific probes. The mtDNAs in the hybrids had segregated independently from the cpDNAs. Nuclear DNA composition (i.e. one or two potato genomes) did not influence the chloroplast type in the C7-hybrids, nor the mtDNA composition of A7- or C7-hybrids. From the cosegregation of specific mtDNA fragments we inferred that both tomato and potato mtDNAs probably have a coxII gene closely linked to 18S+5S rRNA genes. In tomato, atpA, and in potato, atp6 seems to be linked to these mtDNA genes.

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Communicated by P. Maliga

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Wolters, A.M.A., Schoenmakers, H.C.H. & Koornneef, M. Chloroplast and mitochondrial DNA composition of triploid and tetraploid somatic hybrids between Lycopersicon esculentum and Solanum tuberosum . Theoret. Appl. Genetics 90, 285–293 (1995). https://doi.org/10.1007/BF00222216

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  • DOI: https://doi.org/10.1007/BF00222216

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