Figure 2.

The effect of NO on fluorescence induction kinetics. Leaf discs were incubated for 2 h under 150 μmol m⁻² s⁻¹ white light in distilled water (Control), 1 mm GSNO, and 1 mm GSNO + 4 mg mL⁻¹ Hb, then dark adapted for 15 min. Following this treatment, chlorophyll fluorescence of leaf discs was induced by 3 s of 130 μmol m⁻² s⁻¹ red light. Curves show the average of five measurements each.