, Volume 1, Issue 1, pp 20–28 | Cite as

Species differentiation in the section Tuberarium of Solanum with particular reference to the use of interspecific hybridisation in breeding

  • H. W. Howard
  • M. S. Swaminathan


1. It is suggested that there may exist small structural differences between the chromosomes of the genoms of the tuber-bearingSolanum species.

2. For the diploid (2n = 24) species, the best evidence for such small structural differences is obtained from a comparative study of meiosis in amphidiploids and autotetraploids.

3. The problem is more complex in the tetraploid and hexaploid species. Studies of meiosis in F1S. demissum ×S. tuberosum, F1S. demissum ×S. rybinii and the triple hybrid [(S. demissum ×S. rybinii) ×S. tuberosum] suggest that the single genom ofS. rybinii, the two genoms ofS. tuberosum and the three genoms ofS. demissum are similar enough for their chromosomes to form bivalents.

4. From the results of multiple crosses, it appears that species which cannot be crossed directly withS. tuberosum may not have genoms very different from those found in that species.

5. The importance of all these studies to problems of potato breeding involving interspecific hybridisation are considered.


Diploid Species Species Differentiation Gene Substitution Chiasma Frequency Tetraploid Hybrid 
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Copyright information

© Kluwer Academic Publisher 1952

Authors and Affiliations

  • H. W. Howard
    • 1
  • M. S. Swaminathan
    • 1
  1. 1.Plant Breeding InstituteSchool of AgricultureCambridge

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