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An analysis of temperature-dependent asynapsis in Triticum aestivum

Published online by Cambridge University Press:  14 April 2009

M. W. Bayliss  and
Ralph Riley
M. W. Bayliss
Affiliation:
Plant Breeding Institute, Maris Lane, Trumpington, Cambridge
Ralph Riley
Affiliation:
Plant Breeding Institute, Maris Lane, Trumpington, Cambridge
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Measurements of chiasma frequency over a range of temperatures from 9 to 35 °C in euploid wheat and lines nullisomic for chromosome 5D showed the absence of chromosome 5D greatly to increase the sensitivity of chiasma frequency to temperature, resulting in complete univalence at the lowest temperatures. Careful examination of meiotic prophase showed the lowering of chiasma frequency to be correlated with failure of zygotene chromosome pairing, justifying the use of the term asynaptic. Observation of the pairing behaviour of an isochromosome in the nullisomic 5D background suggested that the asynapsis was due to a failure in the mechanism of chromosome pairing rather than of the pre-alignment of homologues. The observed effects in the absence of chromosome 5D could be due to the presence of a recessive allele at the locus of chromosome 5A, also known to control stability of chiasma frequency to temperature. In conclusion it is pointed out that in euploid wheat the sensitivity of chiasma frequency to temperatures within the normal meteorological range could influence the cytological stability of the wheat crop.

Information

Type
Research Article
Information
Genetics Research , Volume 20 , Issue 2 , October 1972 , pp. 193 - 200
Copyright
Copyright © Cambridge University Press 1972

References

REFERENCES

Avivi, L., Feldman, M. & Bushuk, W. (1969). The mechanism of somatic association in common wheat, Triticum aestivum (L.). I. Suppression of somatic association by colchicine. Genetics 62, 745–752.CrossRefGoogle Scholar
Bayliss, M. W. (1972). Ph.D. Thesis, University of Cambridge.Google Scholar
Chao, C. Y. & Hu, W. L. (1961). The effect of temperature on a desynaptic gene in rice. Botanical Bulletin of Academia Sinica (Taipei) 2 (2), 87–100.Google Scholar
Dowrick, G. J. (1956). The influence of temperature on meiosis. Heredity 11, 37–49.CrossRefGoogle Scholar
Driscoll, C. J. & Darvey, N. L. (1970). Chromosome pairing: effect of colchicine on an iso-chromosome. Science 169, 290–291.CrossRefGoogle Scholar
Feldman, M. (1968). Regulation of somatic association and meiotic pairing in common wheat. Proceedings Third International Wheat Genetics Symposium, pp. 169–178.Google Scholar
Hillary, B. B. (1939). Improvements to the permanent root-tip squash technique. Stain Technology 14, 97–99.CrossRefGoogle Scholar
Li, H. W., Pao, W. K. & Li, C. H. (1945). Desynapsis in common wheat. American Journal of Botany 32, 92–100.CrossRefGoogle Scholar
Mather, K. (1938). Crossing-over. Biological Reviews 13, 252–289.Google Scholar
Rieger, R., Michaelis, A. & Green, M. M. (1968). Glossary of Genetics and Cytogenetics. Berlin: Springer-Verlag.CrossRefGoogle Scholar
Riley, R. (1966). Genotype–environmental interaction affecting chiasma frequency in T. aestivum. In Chromosomes Today, vol. 1 (ed. Darlington, C. D. and Lewis, K. R.), pp. 57–65.Edinburgh: Oliver and Boyd.Google Scholar
Riley, R. & Chapman, V. (1967). Effect of 5Bs in suppressing the altered dosage of 5BL on meiotic chromosome pairing in T. aestivum. Nature 216, 60–62.Google Scholar
Riley, R., Chapman, V., Young, R. M. & Belfield, A. (1966). Control of meiotic chromosome pairing by the chromosomes of homoeologous group 5 of T. aestivum. Nature 212, 1475–1477.Google Scholar
Riley, R. & Hayter, A. M. (1967). Duplicate genetic activities affecting meiotic chromosome pairing at low temperatures in Triticum. Nature 216, 1028–1029.Google Scholar
Riley, R. & Kimber, G. (1961). Aneuploids and the cytogenetic structure of wheat varietal populations. Heredity 16, 275–290.Google Scholar
Sears, E. R. (1954). The aneuploids of common wheat. Bulletin of the University of Missouri Agricultural Experiment Station, no. 572.Google Scholar
Soost, R. K. (1951). Comparative cytology and genetics of asynaptic mutants in Lycopersicum esculentum. Genetics 36, 410–434.CrossRefGoogle Scholar
Wilson, J. Y. (1959). Chiasma frequency in relation to temperature. Genetica 29, 290–303.Google Scholar