CYTOGENETIC AND MORPHOBIOLOGICAL FEATURES OF SPRING COMMON WHEAT ALLOLINES WITH CYTOPLASMS OF AGROPYRON TRICHOPHORUM (LINK) RICHT AND AEGILOPS-VARIABILIS L

Spring common wheat alloplasmic lines, which combined cytoplasms of Ag ropyron trichophorum (Link.) Richt. or Aegilops variabilis L. with nuc lei of cultivars Belorusskaya 80 or Novosibirskaya 67, were studied. T he processes of growth depression, decrease in ear fertility, and diso rders in MI meiosis were higher in Agropyron cytoplasm than in Aegilop s cytoplasm. Both genotypes in cytoplasm of Ag. trichophorum contained a microchromosome pair in addition to the usual wheat chromosomes (42 + 2 micro). The microchromosomes were maintained during 21 backcrosse s, in which nuclei of cv. Penjamo 62, Belorusskaya 80, and Novosibirsk aya 67 were introduced into cytoplasm of Ag. trichophorum. This fact s hows the significance of the microchromosomes for normalization of nuc lear-cytoplasmic interactions.