Figure 5.

Maximal level of LHCII mRNA and levels of ELIP mRNA and protein in barley leaves grown for 1 (white bars) or 3 (black bars) d under low or high PSII excitation pressure in air or in 50 μg mL⁻¹ CO₂ plus 3% O₂. Maximum quantum yield for PSII photochemistry (F_m − F_o)/F_m: 0.79 ± 0.01 after 3 d in air at 100 μmol photons m⁻² s⁻¹; 0.81 ± 0.01 after 3 d at 100 μmol photons m⁻² s⁻¹ in low CO₂ and O₂; 0.69 ± 0.02 after 3 d in air at 1500 μmol photons m⁻² s⁻¹; and 0.74 ± 0.02 after 3 d at 500 μmol photons m⁻² s⁻¹ in low CO₂ and O₂. Results are expressed relative to the highest value. Data are mean values of three experiments, with sd being always less than 15%.