Figure 3: The activities of antioxidant enzymes in the leaves and stems of tomato grown for 21 days under light-emitting diode (LED) lights. (A,B) superoxide dismutase (SOD); (C,D) catalase (CAT); (E,F) ascorbate peroxidase (APX); and (G,H) glutathione reductase (GR). Control represents broad-spectrum-white LED. Error bars represents the standard deviation (n=3). Bars with the same low case letter are not significantly different (p>0.05), as assessed by Tukey’s honestly significant difference.