The causes of different transmission rates via gametes of two different homoeologous univalents of the wheat-rye di-monosomic

Meiosis in wheat-rye di-monosomics containing two univalents of different genomes (LA-IR, 5A-5R, 5D-5R, and 5A-5D) was studied. It was shown that, under the same genotypic conditions, two homoeologous univalents differed in the orientation of kinetochores of the sister chromatids in MI of meiosis, the frequency of equational division at Al, and their transmission rate via gametes. It was also demonstrated that the level of equational division of a univalent and its transmission rate via gametes differed in relation to the genotypic environment. The results obtained indicate that the variation observed in univalent transmission rate via gametes of aneuploid forms is caused for two reasons: (1) the Edu genes for equational division of univalents at AI and (2) the structural differences in the centromeric regions of univalents from different genomes.