COMMON WHEAT LINES WITH GENETIC MATERIAL FROM AEGILOPS SPELTOIDES TAUSCH

Lines of spring common wheat (L.500, L.501, and L.592) possessing gene tic material of the species Aegilops speltoides Tausch. were obtained by distant hybridization combining backcrosses with self-pollination. All the lines were tested for resistance to brown rust, powdery mildew , and the most widespread Fusarium species. A probable cytogenetic mec hanism of introgression of genes for morphological markers and resista nce to phytopathogens was established. In L.500 and L.501, introgressi on was determined by 2BL.2SL and 1SS.1BL translocations, respectively. Absence of heterochromatin markers on chromosomes did not allow us to identify any translocation in L.592. In L.500 and L.501, high resista nce to brown rust was determined by expression of three duplicated rec essive genes, whereas resistance to powdery mildew was controlled by t wo duplicated recessive genes. The lines obtained were characterized b y high productivity: they were recommended for breeding and genetic st udies as sources of genes for resistance to powdery mildew and several Fusarium species (causing root blight) and as donors of new genes for brown rust resistance.