Figure 9.

Oxidative stress analysis of transgenic lines and WT plants. (A) Phenotypes of 5-week-old oxFtbHLH3s and WT plants were treated with 20 μM methyl viologen (MV) for 15 days; (B) The survival rates of oxFtbHLH3s and WT plants after oxidative stress; (C,D) Histochemical staining assays were used to detect ${\text{O}}_2^{-}$ and H₂O₂ by NBT (C) and DAB (D) staining, respectively.