PECULIARITIES OF KARIOTYPE STABILIZATION IN THE PROGENY FROM CROSSING OF THE WHEAT-RYE SUBSTITUTED LINE 1R(1A) WITH DIPLOID RYE

The results of the comparative analysis of the process of karyotype stabilization in amphihaploids from crossing diploid rye with common wheat (С29 × R) and with wheat-rye substituted line 1R(1А) (1R(1А) × R) are presented. It was shown, that in the progeny from crossing C29 × R the karyotype is rapidly stabilized at the octoploid level, and hybrids have the genomic structure of AABBDDRR already in F₃. In hybrid material from 1R(1A) × R crossing there is a tendency of R-chromosome elimination from the karyotype: 3R, 5R, 6R and 7R chromosomes were not detected in F₃, only 1R and 4R pairs remained in F₅. In this case, the 1R pair replaced the 1A pair, 4R pair exist as an additional one to the complete wheat chromosome set (AABBDD) in this homeological group in some part of plants and as 4R(4А)- or 4R(4B)- substitution in another part of plants. In general, the predominant tendency of karyotype stabilization in the material from crossing 1R (1A) × R is to return to the original wheat-rye substituted line. The obtained data testify to the significant influence of 1R (1A)-substitution on the process of amphihaploid ABDR stabilization and on the possibility of obtaining new types of wheat-rye hybrids in such crosses.

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