Figure 11.

Measurement of State 1–State 2 Transitions.

Plants, upon dark adaptation for 1 h, were illuminated with blue light (40 μmol m⁻² s⁻¹, wavelength <500 nm) for 15 min to reach State II. Far-red light source was used to induce transition to State I. Values of F_m, F_m′, and F_m″ were determined by light saturation pulses (4500 μmol m⁻² s⁻¹, 0.6 s).