Figure 3. Relationships between simulated photosynthetic leaf N content (Np _ac) (A), net photosynthesis (A _n) (B) and photosynthetic N use efficiency (PNUE) (C) and the photosynthetic traits k ₃ and J _fac under standard mean environmental conditions (PPFD  = 666 µmol m⁻² s⁻¹, T _g = 16.9°C, h _s = 0.74).

k ₃ is the ratio between and Np _a. J _fac is the ratio between J _max and . A mesh of k ₃ values varying between 10 and 300 µmol g⁻¹ N s⁻¹ with 20 steps and of J _fac values varying between 1.75 and 3.5 with 0.05 steps was used. Figures D–E–F, relationships between (Np _ac) (D), net photosynthesis (A _n) (E) and photosynthetic N use efficiency (PNUE) (F) and the radiation (PPFD) and temperature (T _g) conditions during growth. Averages over the dataset of leaf photosynthetic parameters (k ₃, J _fac and SLA) are used (k ₃ = 59.1 µmol g⁻¹ N _pa s⁻¹, J _fac = 2.45, SLA  = 17.7 m² kg⁻¹ DM). The mesh for temperature is 0.5°C between 10 and 30°C and the mesh for radiation is 50 µmol m⁻² s⁻¹ between 300 and 1200 µmol m⁻² s⁻¹. The values of h _s and T _g were fixed at 0.8 and 20°C, respectively. A _n was calculated with the coordinated leaf protein content and PNUE was calculated as the ratio between A _n and Np _ac.