Euphytica

, Volume 27, Issue 1, pp 113–116

On the number and size of cross combinations in a breeding programme of self-fertilizing crops

  • K. Yonezawa
  • H. Yamagata
Article

Summary

The number and size of crosses in a breeding programme were discussed to the conclusion that the number of crosses rather than the size of a cross should be increased with a given total population size. The advantage due to this manipulation, however, is relatively small when such genotypes as improved for many (twenty-five or more) loci are to be obtained, or when a high proportion (around 0.1 or more) of available combinations have the potentiality of releasing the objective genotypes. In such a case, the ease with which crossing and cultivation can be carried out becomes the decisive factor.

Index words

Self-fertilizing crops number of cross combinations size of cross combination breeding method 

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References

  1. Frey, K. J., 1975. Breeding concepts and techniques for selfpollinated crops. In: International workshop on grain legumes. pp. 257–278. ICRISAT, Begumpet, Hyderabad 500016 (A. P.), India.Google Scholar
  2. Ishizumi, K., 1976. On the variety Koshihikari and its sister varieties. In: Breeding of rice varieties. pp. 73–196. Fuji Shuppan, Tokyo. (in Japanese).Google Scholar
  3. Kushibuchi, K., 1976. Method of rice breeding (and personal communication). In: Breeding of rice varieties. pp. 1–38. Fuji Shuppan, Tokyo. (in Japanese).Google Scholar
  4. Palmer, T. P., 1953. Progressive improvement in self-fertilized crops. Heredity 7: 127–129.Google Scholar

Copyright information

© H. Veenman En Zonen B.V. 1978

Authors and Affiliations

  • K. Yonezawa
    • 1
  • H. Yamagata
    • 1
  1. 1.Laboratory of Plant Breeding, Faculty of AgricultureKyoto UniversityKyotoJapan

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