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Homoeologous pairing of a chromosome from Agropyron elongatum with those of Triticum aestivum and Aegilops speltoides

Published online by Cambridge University Press:  14 April 2009

Roy Johnson  and
Gordon Kimber
Roy Johnson
Affiliation:
Plant Breeding Institute, Cambridge
Gordon Kimber
Affiliation:
Plant Breeding Institute, Cambridge
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1. Complex hybrids were produced having twenty-nine chromosomes, consisting of one telocentric and twenty complete chromosomes of T. aestivum (2n = 6x = 42), seven complete chromosomes of Ae. speltoides (2n = 2x = 14) and one telocentric chromosome derived from A. elongatum (2n = 10x = 70). The presence of the Ae. speltoides genome permitted pairing between homoeologous chromosomes at meiosis and the behaviour of the two telocentric chromosomes was observed.

2. The A. elongatum chromosome was seen to pair with chromosomes homoeologous to those of group 6. There was no evidence that it paired with chromosomes of any other group.

3. When the A. elongatum telocentric and those of 6A and 6D occurred in the same configuration it was evident that the telocentrics 6A and 6D were for corresponding chromosome arms, and the A. elongatum telocentric for the opposite arm.

4. The average rate of pairing was much lower for the A. elongatum telocentric than for wheat telocentrics. Previous studies had indicated very good genetic compensation of the A. elongatum chromosome for chromosomes 6A and 6D. It was therefore indicated that genetic equivalence and pairing affinity were not closely related in this case. Some implications of this are discussed.

Type
Research Article
Information
Genetics Research , Volume 10 , Issue 1 , August 1967 , pp. 63 - 71
Copyright
Copyright © Cambridge University Press 1967

References

REFERENCES

Johnson, R. (1966). The substitution of a chromosome from Agropyron elongatum for chromosomes of hexaploid wheat. Can. J. Genet. Cytol. 8, 279–292.Google Scholar
Kimber, G. & Riley, R. (1963). The relationships of the diploid progenitors of hexaploid wheat. Can. J. Genet. Cytol. 5, 83–88.CrossRefGoogle Scholar
Knott, D. R. (1958). The effect on wheat of an Agropyron chromosome carrying rust resistance. Proc. X Int. Congr. Genet. (Montreal) 1958, 2, 148.Google Scholar
Knott, D. R. (1964). The effect on wheat of an Agropyron chromosome carrying rust resistance. Can. J. Genet. Cytol. 6, 500–507.CrossRefGoogle ScholarPubMed
McFadden, E. S. & Sears, E. R. (1946). The origin of Triticum spelta and its free-threshing hexaploid relatives. J. Hered. 37, 81–89, 107–116.CrossRefGoogle ScholarPubMed
Okamoto, M. (1957). Further information on identification of the chromosomes in the A and B genomes. Wheat Inf. Serv. Kyoto Univ. 6, 3–4.Google Scholar
Riley, R. (1960). The diploidisation of polyploid wheat. Heredity, Lond. 15, 407–429.CrossRefGoogle Scholar
Riley, R. (1964). Cytogenetics and plant breeding. Proc. XI Int. Congr. Genet. (The Hague) 1963, 3, 681–688.Google Scholar
Riley, R. & Chapman, V. (1958). Genetic control of the cytologically diploid behaviour of hexaploid wheat. Nature, Lond. 182, 713–715.CrossRefGoogle Scholar
Riley, R. & Chapman, V. (1964). Cytological determination of the homoeology of chromosomes of Triticum aestivum. Nature, Lond. 203, 156–158.CrossRefGoogle Scholar
Riley, R. & Chapman, V. (1966 a). Estimates of the homoeology of wheat chromosomes by measurements of differential affinity at meiosis. In Chromosome Manipulations and Plant Genetics (Riley, R. and Lewis, K. R., eds.), a supplement to Heredity, Lond. 20, 46–58. Edinburgh: Oliver and Boyd.Google Scholar
Riley, R. & Chapman, V. (1966 b). The homoeology of an Aegilops chromosome causing stripe rust resistance. Can. J. Genet. Cytol. 8 (in press).CrossRefGoogle Scholar
Riley, R. & Kempanna, C. (1963). The homoeologous nature of the non-homologous pairing in Triticum aestivum deficient for chromosome V (5B). Heredity, Lond. 18, 287–306.CrossRefGoogle Scholar
Riley, R. & Kimber, G. (1966). The transfer of alien genetic variation to wheat. Rep. Pl. Breed. Inst. 1964–65.Google Scholar
Riley, R., Chapman, V. & Kimber, G. (1959). Genetic control of chromosome pairing in intergeneric hybrids with wheat. Nature, Lond. 183, 1244–1246.CrossRefGoogle ScholarPubMed
Riley, R., Kimber, G. & Chapman, V. (1961). The origin of the genetic control of the diploid-like behaviour of polyploid wheat. J. Hered. 52, 22–26.CrossRefGoogle Scholar
Riley, R., Kimber, G. & Law, C. N. (1964). Cytogenetics Section Report. Rep. Pl. Breed. Inst. 1962–63.Google Scholar
Riley, R., Unrau, J. & Chapman, V. (1958). Evidence on the origin of the B genome of wheat. J. Hered. 49, 91–97.Google Scholar
Sears, E. R. (1954). The aneuploids of common wheat. Mo. Agr. Expt. Sta. Res. Bull. 572.Google Scholar
Sears, E. R. (1966). Nullisomic-tetrasomic combinations in hexaploid wheat. In Chromosome Manipulations and Plant Genetics (Riley, R. and Lewis, K. R., eds.), a supplement to Heredity Lond. 20, 29–45. Edinburgh: Oliver and Boyd.CrossRefGoogle Scholar