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Somatic hybridization as a tool for tomato breeding

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Abstract

Protoplast fusion can be used to produce somatic hybrids of species that cannot be obtained by sexual hybridization. The possibility to introgress genes from Solanum species into the cultivated tomato species Lycopersicon esculentum, and to obtain novel cytoplasm-nucleus combinations (cybrids) was considered as an important strategy to extend the genetic variation available for tomato breeding. Somatic hybrids between L. esculentum and other Lycopersicon species, as well as between L. esculentum and Solanum or Nicotiana species, have been produced. Specific mutants, genotypes with antibiotic resistances, and metabolic inhibition by iodoacetate or iodoacetamide and irradiation were used for the selection of hybrids. In addition, the improvement of protoplast culture techniques and the use of the favourable tissue culture traits derived from species such as L. peruvianum, which have been introduced into tomato by classical breeding, allowed the efficient recovery of somatic hybrids. However, the occurrence of somatic incongruity in fusion combinations of L. esculentum and Solanum and even more in L. esculentum and Nicotiana, did not allow the production of true cybrids and/or fertile hybrids, indicating the importance of both cytoplasm-nucleus and nucleus-nucleus interactions in somatic incongruity. Another problem with fusions between distantly related species is the strongly reduced fertility of the hybrids and the very limited homoeologous recombination between chromosomes of the parental species. Partial genome transfer from donor to recipient through microprotoplast (+) protoplast fusion, and the production of monosomic or disomic chromosome addition lines, light overcome some of these problems. In symmetric somatic hybrids between L. esculentum and S. tuberosum the occurrence of limited somatic and meiotic recombination was demonstrated. Fertile progeny plants could be obtained, though at a low frequency, when embryo rescue was performed on a large scale after backcrossing hexaploid somatic tomato (+) potato hybrids with a tetraploid potato genotype. The potential value of genomic in situ hybridization (GISH) and RFLPs for the analysis of the genome/chromosome composition of the hybrids has been demonstrated for intergeneric somatic hybrids between Lycopersicon and Solanum.

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Abbreviations

cpDNA:

chloroplast DNA

mtDNA:

mitochondrial DNA

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Authors and Affiliations

  1. Department of Genetics, Wageningen Agricultural University, Dreijenlaan 2, NL-6703 HA, Wageningen, The Netherlands

    Anne-marie Wolters, Hans de Jong, Herman Schoenmakers, Jelle Wijbrandi & Maarten Koornneef

  2. Department of Plant Breeding, Wageningen Agricultural University, P.O. Box 386, NL-6700 AJ, Wageningen, The Netherlands

    Evert Jacobsen

  3. Department of Agronomy & Horticulture, New Mexico State University, 88003, Las Cruces, NM, USA

    Mary O'Connell & Guusie Bonnema

  4. DLO-Centre for Plant Breeding and Reproduction Research (CPRO-DLO), P.O. Box 16, NL-6700 AA, Wageningen, The Netherlands

    K. Sree Ramulu

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Wolters, Am., Jacobsen, E., O'Connell, M. et al. Somatic hybridization as a tool for tomato breeding. Euphytica 79, 265–277 (1994). https://doi.org/10.1007/BF00022527

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