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 g enomes (LA-IR, 5A-5R, 5D-5R, and 5A-5D) was studied. It was shown that, und er the same genotypic conditions, two homoeologous univalents differed in t he orientation of kinetochores of the sister chromatids in MI of meiosis, t he 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 t he genotypic environment. The results obtained indicate that the variation observed in univalent transmission rate via gametes of aneuploid forms is c aused for two reasons: (1) the Edu genes for equational division of univale nts at AI and (2) the structural differences in the centromeric regions of univalents from different genomes.