XVI International Botanical Congess

Genetic and cytogenetic investigation of collection of alloplasma-tic lines of spring and winter wheat BC7-17 on the 45 cytoplasms of species Triticum, Aegilops, Agropyron were conducted. The phenomenon of cytoplasmic male sterility at hybrid plants and backcrosses of Triticum aes-tivum L. on the cytoplasmes of species T.Kiharae, T.timopheevii Zhuk., T.aephiopicum Jakubz., T.spelta L., T.macha Dek. et Men., T.dicoccoides (Koern.) Schweinf. was discovered. Amongst of progenies of combinations T.timopheevii Zhuk. x T.aestivum L. and T.Kiharae x T.aestivum L. were revealed restorers of fertility. Cytogenetic investigations of hybrids and alloplas-matic lines of soft wheat BC6-11 were discovered unstable of processes of meiosis: in MI were observed from 18 to 20 biva-lents, 1-7 opening bivalents, from 1 to 5-7 univalents in MI, chromosomal bridges and fall behind chromosomes in AI and AII, micro- and macronucleus in diades and tetrades. The problems of using alloplasmatic lines soft wheat in genetic and breeding programms in region, for selection of high-yielding cultivars are discussed.