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Somatic hybridization between potato and Nicotiana plumbaginifolia

1. Spontaneous biparental chromosome elimination and production of asymmetric hybrids

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Summary

Electrofusion was carried out between mesophyll protoplasts from the transformed diploid S. tuberosum clone 413 (2n=2x=24) which contains various genetic markers (hormone autotrophy, opine synthesis, kanamycin resistance, β-glucuronidase activity) and mesophyll protoplasts of a diploid wild-type clone of N. plumbaginifolia (2n=2x=20). Hybrid calli were obtained after continuous culture on selection medium containing kanamycin. Parental chromosome numbers, determined at 2 months after fusion, revealed hybrid-specific differences between the individual calli. On the basis of these differences three categories of hybrids were distinguished. Category I hybrids contained between 8 and 24 potato chromosomes and more than 20 N. plumbaginifolia chromosomes; category II hybrids had between 1 and 20 N. plumbaginifolia chromosomes and more than 24 potato chromosomes; category III hybrids contained diploid or subdiploid numbers of chromosomes from both parents. The hybrids were evenly distributed over the three categories. After a 1-year culture of 24 representative hybrid callus lines on selection medium the karyotype of 10 hybrids remained stable, whereas 8 hybrids showed polyploidization of the genome of one parent, together with no or minor changes of the chromosome numbers of the other parent. Six hybrids showed slight changes in the hybrid karyotype. The elimination of chromosomes of a particular parent was not correlated to their metaphase location. The processes of spontaneous biparental chromosome elimination leading to the production of asymmetric hybrids of different categories are discussed.

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Authors and Affiliations

  1. Department of Cell Biology, Centre for Plant Breeding and Reproduction Research CPRO-DLO, P.O. Box 16, NL-6700, AA Wageningen, The Netherlands

    L. J. W. Gilissen, M. J. van Staveren, H. A. Verhoeven & K. Sree Ramulu

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  1. L. J. W. Gilissen
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  2. M. J. van Staveren
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  3. H. A. Verhoeven
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  4. K. Sree Ramulu
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Communicated by H. F. Linskens

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Gilissen, L.J.W., van Staveren, M.J., Verhoeven, H.A. et al. Somatic hybridization between potato and Nicotiana plumbaginifolia . Theoret. Appl. Genetics 84, 73–80 (1992). https://doi.org/10.1007/BF00223983

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  • DOI: https://doi.org/10.1007/BF00223983

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