## 3 Results
### Antioxidant Enzyme Activity in Wheat Roots  
The comparison of CAT activity in the roots of the control seedlings showed that the Delaware cultivar had the highest enzyme activity, whereas the Tobak cultivar had the lowest activity. Similarly, as in wheat seed embryos in the imbibition phase, CAT activity in the roots of all cultivars decreased significantly with the increase in NaF concentration. Compared to the control, the highest inhibition of enzyme activity was observed for the NaF concentration of 10.0 mmol-dm\({}^{-3}\), and it was 90%, 94%, and 61% for the Delaware, Tobak, and Arkadia cultivars, respectively (Table 3).  
\begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**NaF Concentration (mmol-dm\({}^{-3}\))**} & \multicolumn{3}{c}{**Winter Wheat Cultivar**} \\ \cline{2-4}  & **Delawar** & **Tobak** & **Arkadia** \\ \hline
0 (control) & 145.2 \(\pm\) 1.5 c & 249.7 \(\pm\) 3.3 a & 182.7 \(\pm\) 6.1 b \\
2.5 & 118.4 \(\pm\) 1.5 d & 144.4 \(\pm\) 10.8 c & 143.9 \(\pm\) 2.4 c \\
5.0 & 116.1 \(\pm\) 1.2 d & 124.8 \(\pm\) 1.2 d & 138.7 \(\pm\) 2.9 c \\
8.0 & 58.4 \(\pm\) 0.9 fg & 89.8 \(\pm\) 1.8 e & 71.1 \(\pm\) 4.2 f \\
10.0 & 52.5 \(\pm\) 0.4 g & 32.2 \(\pm\) 6.8 h & 67.0 \(\pm\) 3.2 f \\ \hline \hline \end{tabular} Data were given as means \(\pm\) D (n = 3). The values marked with the same letters do not differ statistically at \(p\) = 0.05 (post hoc Tukey HSD test).  
\end{table}
Table 1: Catalase activity (\(\mu\)mol H\({}_{2}\)O\({}_{2}\) g\({}^{-1}\).FW-min\({}^{-1}\)) in wheat embryos during imbibition in NaF solutions.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**NaF Concentration (mmol-dm\({}^{-3}\))**} & \multicolumn{3}{c}{**Winter Wheat Cultivar**} \\ \cline{2-4}  & **Delawar** & **Tobak** & **Arkadia** \\ \hline
0 (control) & 33.9 \(\pm\) 0.4 j & 52.0 \(\pm\) 0.72 e & 46.9 \(\pm\) 0.6 f \\
2.5 & 35.2 \(\pm\) 0.7 ji & 74.2 \(\pm\) 0.38 b & 47.6 \(\pm\) 1.2 f \\
5.0 & 43.5 \(\pm\) 0.5 g & 82.3 \(\pm\) 0.66 a & 57.6 \(\pm\) 0.7 d \\
8.0 & 31.0 \(\pm\) 0.2 k & 40.7 \(\pm\) 1.19 h & 60.8 \(\pm\) 0.5 c \\
10.0 & 19.3 \(\pm\) 0.81 & 36.7 \(\pm\) 1.71 i & 53.4 \(\pm\) 1.4 e \\ \hline \hline \end{tabular} Data were given as means \(\pm\) SD (n = 3). Values marked with the same letters do not differ statistically at \(p\) = 0.05 (post hoc Tukey HSD test).  
\end{table}
Table 2: Peroxidase activity (\(\mu\)mol purpurrogallin-g\({}^{-1}\) FW-min\({}^{-1}\)) in wheat embryos during imbibition in NaF solutions.  
Contrary to the wheat seed embryos in the imbibition phase, no significant differences in root POX activity were found between cultivars. A significant stimulation of POX activity was observed in the roots of the Arkadia cultivar for all NaF concentrations. The highest increase of activity was shown for the NaF concentration, and it was 82% compared with the control (Table 4). However, a significant stimulation of POX activity occurred in the roots of the Dalewar cultivar for concentrations of 8.0 mmol-dm\({}^{-3}\) and 10.0 mmol-dm\({}^{-3}\), and they were 37% and 62% compared with the control, respectively, whereas a significant increase in activity was reported in the roots of the Tobak cultivar only for a concentration of 10.0 mmol-dm\({}^{-3}\) (136%, compared with the control).