Table 1 Parameters of the light response curve of fully expanded leaves of Hevea brasiliensis exposed to ambient air and ozone (200 ppb for 2 hr) which were estimated by fitting the data to a non-rectangular hyperbola equation. Initial slope (α), convexity parameters (θ), maximum photosynthesis (Pmax; μmol CO2 m-2 s-1) and dark respiration (Rd; μmol CO2 m-2 s-1. Data are mean of four replications ± SE.