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Transfer of disease resistance within the genus Brassica through asymmetric somatic hybridization

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Summary

Asymmetric somatic hybrid plants between Brassica napus L. (oilseed rape genome AACC) and a transgenic line of Brassica nigra L. Koch (black mustard genome BB) were tested for their resistance against rapeseed pathogens Phoma lingam (black leg disease) and Plasmodiophora brassicae (club root disease). The transgenic B. nigra line used (hygromycin-resistant, donor) is highly resistant to both fungi, whereas B. napus (recipient) is highly susceptible. The asymmetric somatic hybrids were produced using the donor-recipient fusion method (with X-irradiation of donor protoplasts) reported by Zelcer et al. (1978) for the production of cybrids. Using hygromycin-B for selection, a total of 332 hybrid calli were obtained. Regenerants, resistant or susceptible to both diseases, were selected. Many hybrids expressed resistance to only one pathogen. Dot blot experiments showed that the asymmetric hybrid plants contained varying amounts of the donor genomic DNA. Furthermore, a correlation was detected between the radiation dose and the degree of donor DNA elimination.

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Authors and Affiliations

  1. Institute of Applied Genetics, Free University Berlin, Albrecht-Thaer-Weg 6, D 14195, Berlin, Germany

    M. Gerdemann-Knörck, S. Nielen, C. Tzscheetzsch, J. Iglisch & O. Schieder

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  1. M. Gerdemann-Knörck
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  2. S. Nielen
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  3. C. Tzscheetzsch
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  4. J. Iglisch
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  5. O. Schieder
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Gerdemann-Knörck, M., Nielen, S., Tzscheetzsch, C. et al. Transfer of disease resistance within the genus Brassica through asymmetric somatic hybridization. Euphytica 85, 247–253 (1995). https://doi.org/10.1007/BF00023953

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