The effect of pretreatment with ethephone (ET) and 1-MCP on the relative expression of genes involved in the biosynthesis (TaIPT2, TaIPT5), O-glucosylation (TaZOG2-1), deglucosylation (TaGLU1-1, TaGLU4), and oxidative degradation (TaCKX1) of cytokinins in two wheat cultivars of Kaz10 (A,C) and Om35 (B,D) infected with virulent SnB (A,B) and avirulent Sn4VD S. nodorum isolates (C,D). Expression values were normalized to the housekeeping gene TaRLI as an internal reference and expressed relative to the normalized expression levels in mock-treated control (water) plants at 0 hpi. Symbols are the same as in Figure 2. Figures present means ± SE (n = 6). Asterisks indicate means statistically different from the control and different number of asterisks allows (*, **, ***, ****) distinguishing of significantly different variants according to the LSD test at * p < 0.05, ** p < 0.01, *** p < 0.001, **** p < 0.0001.