| As it is evident from Table 3, chromosomes 4A,
4D, 1B, 1D, 2B and 6D in hybrids F1 CS x Norrona, and 3A, 4B,
1B, 3D, 6B and 7D in hybrids F1 CS x T-13 are involved in translocations.
On the basis of the frequency of trivalent formations we believe that the
chromosomal interchanges between varieties Norrona and CS involve 4A/4D,
1B/1D and 2B/6D, whereas the mutant T-13 has reciprocal translocations 3A/4B,
1B/3D and 6B/7D in relation to the variety CS. The occurrence of low frequency
of trivalent and quadrivalent formations in almost all monosomic and disomic
F1 hybrids is probably indication of rather small chromosome
segments being involved in translocations. The exception is only the interchange
4A/4D in cross CS x Norrona, including a comparatively large segment of
chromosome 4A, the evidence of this came from high rate, 30.95 per cent,
of trivalent configuration in this line. References BAIER, A.C., ZELLER. F.J. & FISCHBECK, G. 1974. Canad. J. Genet. Cytol. 16: 349-354. BAKER, E.P. & MCINTOSH, R.A. 1966. Canad. J. Genet. Cytol. 8: 592-599. BANNIER, E. 1978. Arch. Zuchtungsforsch. 8: 325-332. LAW, C.N., & WORLAND, A.J. 1972. In "Plant Breeding Institute Annual Report". Cambridge: 25-65. LINDLE-LAURSEN, J. & LARSEN, J. 1974. Hereditas 78: 245-250. METTIN, D. & KLEIN, V. 1973. EWAC Newsletter 4: 30-34. MORRIS, R. & SEARS, E.R. 1967. In "Wheat and wheat Improvement". Madison, Wisconsin, USA: 19-87. RILEY, R., COUCOLI, H. & CHAPMAN, V. 1967. Heredity 22: 233-248. VEGA, C. & LACADENA, J.R., 1982. Theor. Appl. Genet. 61: 129-133. |
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