Figure 3.

Accumulation of hydrogen peroxide and superoxide anion as affected by TDC silencing and exogenous melatonin in tomato plants under chilling stress. (A) H₂O₂ level; (B) O₂•^– level. Tomato plants at the 6-leaf stage were exposed to chilling stress (4 °C) for 12 h and leaf samples were collected for the determination of reactive oxygen species (ROS) levels. The values presented are means ± SDs (n = 3). Different letters (a–e) above bars indicate significant difference at p < 0.05 among treatments.