Figure 3.

Plots of the photoacoustically monitored Φ in barley leaves grown under different PSII excitation pressures induced by different light and gas environments versus the PFD of the incident light. ▵, Air and 400 μmol photons m⁻² s⁻¹; □, air and 1500 μmol photons m⁻² s⁻¹; ▵, 70 μg mL⁻¹ CO₂ and 10% O₂ at 750 μmol photons m⁻² s⁻¹. Plants were grown for 8 d in the different light and gas environments.