Abstract
THE wild hexaploid (2n = 72) species Solanum demissum Lindl. has been widely used in breeding for blight (Phytophthora infestans) resistance in potatoes. Crossed with cultivated S. tuberosum varieties (tetraploids with a chromosome number of 2n = 48) it gives pentaploid (2n = 60) hybrids which can be back-crossed by S. tuberosum. An alternative method of breeding has been suggested by Black1. This consists of crossing S. demissum with a diploid (2n = 24) species such as S. Rybinii to get a tetraploid (2n = 48) F1 hybrid, which is then crossed with S. tuberosum varieties. This latter method appears to have much to recommend it, particularly as Thomas2 states that, in the hybrid S. demissum × S. Rybinii and in the triple hybrid (S. demissum × S. Rybinii) × S. tuberosum, “chromosome differentiation between these related species is not sufficient to affect pairing to any extent”. This presumably means that, at least in the triple hybrid, about twenty-four bivalents are formed at meiosis.
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References
Black, W., Proc. Roy. Soc. Edinb., B, 63, 290 (1949).
Thomas, P. T., Thirty-sixth Annual Report, John Innes Horticultural Institution, 11 (1945).
Darlington, C. D., “Recent Advances in Cytology” (2nd edit., J. and A. Churchill, Ltd., London, 1937).
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BAINS, G., HOWARD, H. Haploid Plants of Solanum demissum. Nature 166, 795 (1950). https://doi.org/10.1038/166795a0
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DOI: https://doi.org/10.1038/166795a0
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