Journal of Genetics

, Volume 35, Issue 3, pp 383–386 | Cite as

The chromosome number of the swede,Brassica napus L.

  • H. W. Howard


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.


Chromosome Number Side View Pollen Mother Cell Polar View Haploid Number 


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  1. Catcheside, D. G. (1934). “The relationship in the swede and turnip groups ofBrassica.”Ann. Bot., Lond.,48, 601–33.Google Scholar
  2. Frandsen, H. N. &Winge, O. (1932). “Brassica napocampestris, a new constant amphidiploid species hybrid.”Hereditas, Lund,16, 212–19.Google Scholar
  3. Karpechenko, G. D. (1922). “The number of chromosomes and the genetic correlation of cultivated Cruciferae.”Bull. appl. Bot., St Petersb.,13, 1–14.Google Scholar
  4. —— (1927). “The production of polyploid gametes in hybrids.”Hereditas, Lund,9, 349–68.CrossRefGoogle Scholar
  5. Nagai, K. &Sasaoka, T. (1930). “The number of chromosomes in the cultivatedBrassica.”Jap. J. Genet.5, 151–8.CrossRefGoogle Scholar
  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.Google Scholar

Copyright information

© Indian Academy of Sciences 1938

Authors and Affiliations

  • H. W. Howard
    • 1
  1. 1.School of AgricultureCambridge

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