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Effects of alien and intraspecies cytoplasms on the expression of major nuclear genes of wheat resistance to brown rust: I. Analysis of F-2 reciprocal hybrids



Effects of alien and intraspecies cytoplasms on the expression of major nuclear genes of wheat resistance to brown rust: I. Analysis of F-2 reciprocal hybrids



Genetika 31(1): 72-80



The resistance of wheat reciprocal hybrid seedlings to two clones of brown rust with different virulence is studied. The hybrids are obtained from crosses between isogenic lines of the cultivar Thatcher carrying genes Lr1, Lr9, Lr15, Lr19 and alloplasmatic lines of the cultivar Penjamo 62 with cytoplasms derived from the species Triticum dicoccoides var. fulvovillosum, Aegilops squarrosa var. typica, and Agropyron trichophorum. F-2 hybrids between Th, its isogenic lines, and the euplasmatic cultivar Penjamo 62 are also analyzed. Reciprocal differences in the resistant/susceptible ratio in the F-2 are revealed. These differences may be due to the specific effect of maternal cytoplasm on the expression of the major gene Lr. It is quite possible that it modifies the expression of other genes located in original nuclear genomes of the cultivars Thatcher and Penjamo 62. Complementary interaction of these genes in a hybrid genome led to segregation of a certain proportion of the resistant in the F-2 phenotypes. Another mechanism of maternal cytoplasm control may involve its influence on the transmission of the resistance genes located on different chromosomes of the nuclear genome. Pathogen virulence did not affect resistance only in cross combinations between isogenic lines and the alloplasmatic (trichophorum)-Penjamo 62 one or lines carrying the gene Lr9.

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