Table III.

Fast fluorescence induction parameters

Fast fluorescence induction parameters of curves in Figure 3. 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. The F0, FI-F0, and FP-F0 parameters are shown in arbitrary units. Values represent means ± sd (n = 5).

TreatmentF0FI-F0FP-F0Slope of Curve (FI-FP)
Control258.3 ± 4.646.3 ± 7.6727.0 ± 6.01.1 ± 0.01
GSNO270 ± 6.188.0 ± 6.9309.3 ± 13.30.3 ± 0.04
GSNO + Hb240.0 ± 10.839.7 ± 10.8616.7 ± 38.51.1 ± 0.02