Fig. 7
MWCNT-induced NO production was blocked by tungstate, an inhibitor of NR. Three-day-old tomato seedlings were treated with distilled water and 5 mg/mL MWCNTs with or without 20 μM tungstate (Tg). Changes in NR activity (a) and NO production (b) determined using Greiss reagent method. Data are the means ± SE. Bars denoted by the same letter did not differ significantly at p < 0.05 level according to Ducan’s multiple test