[Development of commercially valuable traits in hexaploid triticale lines with Aegilops introgressions as dependent on the genome composition].

Introgressive hybridization is an efficient means to improve the genetic diversity of cultivated cereals, including triticale. To identify the triticale lines with Aegilops introgressions, genotyping was carried out with ten lines obtained by crossing hexaploid triticale with genome-substitution forms of the common wheat cultivar Avrora: Avrolata (AABBUU), Avrodes (AABBSS), and Avrotika (AABBTT). The genome composition of the triticale lines was studied by in situ hybridization, and recombination events involving Aegilops and/or common wheat chromosomes were assumed for nine out of the ten lines.

[Introgression of Aegilops genetic material into the genome of hexaploid triticale].

Cytological analysis of different meiosis stages was performed in F4 hybrids in comparison with the F1 hybrids obtained through crosses between the hexaploid triticale and genome-substitution forms of Aurolata (AABBUU) and Aurosis (AABBS(sh)S(sh)) wheat, in which D genome of common wheat Aurora was substituted for the genomes of Aegilops umbellulata and Ae. sharonensis, respectively. It was demonstrated that in F4 the level of bivalent conjugation was substantially higher than the expected one.

[Karyologic research on trematodes of the family Schistosomatidae from northwestern Chukota].

Peculiarities of chromosome sets of 4 schistosome species, parasitic in different mollusks from the Chaun lowland were investigated. The karyotype of parthenitae of Trichobilharzia sp. 1 (the intermediate host Sibirenauta picta) consists of 18 elements, of which the 2nd and 6th pairs are submetacentric-metacentric, the other chromosomes are metacentric.