Fig. 3

Activity of superoxide dismutase (SOD) (a), guaiacol peroxidase (GPOX) (b) and total phenols content (c) in leaves of type II energy cane plants (Saccharum spontaneum L.), cultivated in Mn-sufficient and Mn-deficient nutrient solution in the absence (-Si) and in the presence (+ Si) of Si. **Significant at 1% probability; *significant at 5% probability, and ^ns non-significant by the F-test. Different lowercase letters compare Si conditions under the same Mn condition, while different uppercase letters compare Mn conditions under the same Si condition (p < 0.05 by Tukey’s test). Bars represent the standard error of the mean, n = 5