Figure 4.

Modeled relationships between stomatal conductance (g _s) and leaf temperature (T _leaf) – air temperature (T _air) at T _air = 35°C, 40°C, and 45°C at short‐wave radiation (SWR) of 600 W/m² (a) and 1000 W/m² (b) to represent partial and full sun conditions, respectively. Vertical lines indicate mean post‐treatment g _s values of controls (0.0796 mol·m⁻²·s⁻¹) and of the 45‐min and 90‐min groups (0.0451 mol·m⁻²·s⁻¹ for expanding leaves). Incident photosynthetically active radiation (PAR) for each SWR level at a wavelength of 550 nm (average wavelength for the 400–700 nm PAR range) was ~1380 and ~2300 μmol·m⁻²·s⁻¹, respectively. PAR is assumed ~50% of SWR (Britton & Dodd, 1976)