FIGURE 7.

Increases in ${\mathrm{O}}_{\mathrm{2}}^{\mathrm{•-}}$ (A) and H₂O₂ (B) levels in rice roots under alkaline stress. Two-week-old rice seedlings were grown under unstressed control (open columns) or alkaline-stressed (filled columns) conditions for 3 days. Values are means ± SD, n = 3. Asterisks denote a significant difference to the control plants (^∗P < 0.05, ^∗∗P < 0.01).