CYTOGENETIC INVESTIGATION OF TRITICUM-TIMOPHEEVII (ZHUK) ZHUK AND RELATED SPECIES USING THE C-BANDING TECHNIQUE

Triticum timopheevii and related species T. militinae (2n = 28, A'G) a nd T. zhukovskyi (2n = 42, A(m)A(t)G), hybrids T. kiharae, T. miguscho vae, the amphidiploid T. timopheevii x T. tauschii (all 2n=42, A(t)GD) , T. fungicidum (ABA(t)G) and T. timonovum (2n = 56, A(t)A(t)GG) were analyzed using the C-banding technique. Chromosomes of the A(m) and A( t) genomes in the karyotype of T. zhukovskyi differed in their C-bandi ng pattern. Partial substitutions of A(t)-genome chromosomes and a com plete substitution of the G-genome chromosomes by homoeologous chromos omes of an unidentified tetraploid wheat species with an AB genome com position were found in the T. timonovum karyotype. A(t)- and G-genome chromosomes in the karyotypes of all studied species had similar C-ban ding patterns and were characterized by a low level of polymorphism. T he comparative stability of the A(t) and G genomes is determined by th e origin and specifity of cultivation of studied species.