Abstract
Monosomic lines (2n=41) of wheat were crossed with Triticum macha and data were recorded on the monosomic F1's on, a) mean pairing per chromosome, b) multivalent associations per cell and c) chiasma formation per bivalent. Comparison of the data with the control cross (wheat disome × T. macha) revealed that: 1) suppressors for pairing of homoeologous chromosomes are located on chromosomes 4B and 1D of T. macha, the pairing per chromosome in the F1monosomic hybrids of these lines being significantly lower than that of control, 2) chromosomes 6A, 3B, 4B and 1D of T. macha possess promotors for homoeologous chromosome pairing. The monosomic F1hybrids of these lines exhibited significantly higher multivalent associations per cell, as compared with the control, and 3) genes present on chromosomes 4A, 1B, 5B and 1D of T. macha suppress chiasma formation.
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