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The chromosome number of the swede,Brassica napus L.

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The chromosome number of three varieties of swede was found to ben=19 and 2n=38. This agrees with the results of Nagai & Sasaoka (1930) and U (1935). The numbersn=18 and 2n=36, reported in three other papers, are most probably incorrect.

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  1. Catcheside, D. G. (1934). “The relationship in the swede and turnip groups ofBrassica.”Ann. Bot., Lond.,48, 601–33.

  2. Frandsen, H. N. &Winge, O. (1932). “Brassica napocampestris, a new constant amphidiploid species hybrid.”Hereditas, Lund,16, 212–19.

  3. Karpechenko, G. D. (1922). “The number of chromosomes and the genetic correlation of cultivated Cruciferae.”Bull. appl. Bot., St Petersb.,13, 1–14.

  4. —— (1927). “The production of polyploid gametes in hybrids.”Hereditas, Lund,9, 349–68.

  5. Nagai, K. &Sasaoka, T. (1930). “The number of chromosomes in the cultivatedBrassica.”Jap. J. Genet.5, 151–8.

  6. U, N. (1935). “Genome-analysis inBrassica with special reference to the experimental formation ofB. napus and peculiar mode of fertilisation.”Jap. J. Bot. 7, 389–452.

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Correspondence to H. W. Howard.

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Howard, H.W. The chromosome number of the swede,Brassica napus L.. Journ. of Genetics 35, 383–386 (1938).

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  • Chromosome Number
  • Side View
  • Pollen Mother Cell
  • Polar View
  • Haploid Number