Polyembryony In Hybrids Of Wheat-Rye Amphyploid ABDR (2n=42)

The polyembryony was studied in hybrid combinations of wheat-rye amphidiploid ABDR with tetraploid wheats (T.dicoccum var. rufum, T.paleocolchicum Men.), hexaploid wheats (Bezostaya 1, Грекум 75/50, T. аestivum var. velutinum, T. macha Dek. et Men.) and triticales of different ploidy levels (4х/6х/8х). The spontaneous polyembrions of different morphotypes (mono-, merged- and polycoleptiled twin pairs) were isolated starting from F2, F3 and F4 generations. The highest frequency of occurrence for polyembrions was observed in hybrid combinations between ABDR and hexaploid wheats, exept the combination of ABDR with Bezostaya 1, which was differentiated from others by tendency of stabilization of the genome at the tetraploid level by elimination of both R and D genome chromosomes. Among hybrid combinations of ABDR with triticales of different ploidy, the polyembrions were observed only in combination of ABDR with tetraploid triticale.