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The partial stability of additional chromosomes in Solanum tuberosum cv. Torridon

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Summary

Commercial cultivars of the potato (Solanum tuberosum L.) are widely believed to be cytologically invariable (2n=48), although there are several reports of anomalous counts in experimental material. The presence of two additional chromosomes is reported for the first time in cv. Torridon and their stability in the growing plant examined. The additional chromosomes were found to be completely stable in the shoots but were progressively eliminated from the root tissue. Laggards and bridges were commonly observed during somatic division in the roots. Laggards were also present in the shoots and did not change significantly in frequency in the roots during chromosomal loss. Consequently, they were considered as unlikely to have a central involvement in the elimination process. Somatic bridges on the other hand were only found in the roots and increased in occurrence as elimination increased. A link between the appearance of somatic bridges and the elimination of additional chromosomes in the roots is suggested. The possible origins and mechanism of elimination of the additional chromosomes are briefly discussed.

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  1. Scottish Crop Research Institute, Invergowrie, DD2 5DA, Dundee, Scotland, UK

    M. J. Wilkinson

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Wilkinson, M.J. The partial stability of additional chromosomes in Solanum tuberosum cv. Torridon. Euphytica 60, 115–122 (1992). https://doi.org/10.1007/BF00029666

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  • DOI: https://doi.org/10.1007/BF00029666

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