Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-11-20T15:28:44.260Z Has data issue: false hasContentIssue false
  • English
  • Français

Equivalence of the A genome of bread wheat and that of Triticum urartu

Published online by Cambridge University Press:  14 April 2009

Victor Chapman ,
T. E. Miller  and
Ralph Riley
Victor Chapman
Affiliation:
Plant Breeding Institute, Cambridge, England
T. E. Miller
Affiliation:
Plant Breeding Institute, Cambridge, England
Ralph Riley
Affiliation:
Plant Breeding Institute, Cambridge, England
Rights & Permissions [Opens in a new window]

Summary

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Lines of Triticum aestivum Chinese Spring (2n = 6x = 42) which were ditelocentric or doubly ditelocentric, in turn, for the 14 chromosomes of the A and B genomes were pollinated by Triticum urartu (2n = 14). The behaviour of the marked telocentric chromosomes was scored in the 14 distinct hybrids obtained from these pollinations. In 6 of the hybrids in which different A genome chromosomes were marked by telocentrics there were from 50 to 80% of the pollen mother cells in which the telocentrics were paired. In the seven hybrids in which different B genome chromosomes were marked the telocentrics were never paired. It was concluded that the genome of T. urartu matched very closely the A genome of hexaploid wheat and that it did not correspond, as had been proposed by Johnson, to the B genome. The pairing behaviour of the 14 T. aestivum × T. urartu hybrids was compared with earlier results obtained from hybrids between T. aestivum and T. boeoticum. It was proposed that the higher trivalent frequencies seen in the T. boeoticum hybrids could be due to homoeologous pairing and that the genotype of T. boeoticum has the capacity partly to suppress the activity of the Ph locus of chromosome 5B of wheat, as a result of which homoeologous pairing is normally prevented.

Type
Research Article
Information
Genetics Research , Volume 27 , Issue 1 , February 1976 , pp. 69 - 76
Copyright
Copyright © Cambridge University Press 1976

References

REFERENCES

Chapman, V. & Riley, R. (1966). The allocation of the chromosomes of Triticum aestivum to the A and B genomes and evidence of genome structure. Canadian Journal of Genetics and Cytology 8, 57–63.CrossRefGoogle Scholar
Chen, K., Gray, J. C. & Wildman, S. G. (1975). Fraction I protein and the origin of polyploid wheats. Science (in the Press).CrossRefGoogle Scholar
Dover, G. A. & Riley, R. (1972). Variation at two loci affecting homoeologous meiotic chromosome pairing in Triticum aestivum × Aegilops mutica hybrids. Nature New Biology 235, 54, 61–62.CrossRefGoogle Scholar
Dvorak, J. (1972). Genetic variability in Aegilops speltoides affecting homoeologous pairing in wheat. Canadian Journal of Genetics and Cytology 14, 371–380.CrossRefGoogle Scholar
Johnson, B. L. (1975). Identification of the apparent B-genome donor of wheat. Canadian Journal of Genetics and Cytology 17, 21–39.CrossRefGoogle Scholar
Kimber, G. (1973). The relationship of the S-genome diploids to polyploid wheat. Proceedings of the Fourth International Wheat Genetics Symposium, 81–85.Google Scholar
Kimber, G. (1974). A reassessment of the origin of polyploid wheats. Genetics 78, 487–492.CrossRefGoogle ScholarPubMed
Kimber, G. & Athwal, R. S. (1972). A reassessment of the course of evolution in wheat. Proceedings of the National Academy of Science USA 69, 912–915.CrossRefGoogle Scholar
Larsen, J. & Kimber, G. (1973). The effect of the genotype of Triticum speltoides on the pairing of homologous chromosomes. Canadian Journal of Genetics and Cytology 15, 233–236.CrossRefGoogle Scholar
Mello-Sampayo, T. (1971). Promotion of homoeologous pairing in hybrids of Triticum aestivum × Aegilops longissima. Genética Ibérica 23, 1–9.Google Scholar
Rees, H. & Walters, M. R. (1965). Nuclear DNA and the evolution of wheat. Heredity 20, 73–82.CrossRefGoogle Scholar
Riley, R. (1965). Cytogenetics and the evolution of wheat. In Essays on Crop Plant Evolution (ed. Hutchinson, J. B.), pp. 103–122. Cambridge University Press.Google Scholar
Riley, R. (1974). Cytogenetics of chromosome pairing in wheat. Genetics 78, 193–203.CrossRefGoogle ScholarPubMed
Riley, R. & Chapman, V. (1960). The D genome of hexaploid wheat. Wheat Information Service 11, 18–19.Google Scholar
Riley, R., Unrau, J. & Chapman, V. (1958). Evidence of the origin of the B genome of wheat. Journal of Heredity 49, 91–99.CrossRefGoogle Scholar
Sarkar, P. & Stebbins, G. L. (1956). Morphological evidence concerning the B genome of wheat. American Journal of Botany 43, 297–304.CrossRefGoogle Scholar