The decrease of Pn was due to chlorophyll, Gs, Tr, Ci, and chlorophyll fluorescence.
Stomatal limitation led to a reduction of Pn at 5 and 10 μg/mL DBP/DEHP.
Stomatal and non-stomatal limitations caused the decrease in Pn at 20 μg/mL DBP/DEHP.
The toxicity of DBP was significantly greater than that of DEHP.