Fig. 5

MWCNT-induced NO production was blocked by cPTIO, the scavenger of NO. Three-day-old tomato seedlings were treated with distilled water and 5 mg/mL MWCNTs with or without 0.2 mM cPTIO, respectively. a Changes in NR activity (left), and NO production (right) determined using Greiss reagent method. b After treamtent for 24 h, the NO signal was analyzed by LSCM (left) and EPR (right). Scale bar = 0.1 mm. 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