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DHAR-OX plants exhibit less damage following exposure to an acute episode of ozone. The level of H2O2 was measured from the first fully expanded leaf of control (C), DHAR-OX (OX), and DHAR-KD (KD) tobacco collected prior to, immediately after, and 24 h following a 2-h exposure to 200 ppb ozone. Damage from ozone exposure was measured as ion leakage from fully expanded leaves.
