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The present study investigated the possible mediatory role of salicylic acid (SA) in protecting photosynthesis from cadmium (Cd) toxicity. Seeds of maize (Zea mays L., hybrid Norma) were sterilized and divided into two groups. Half of the seeds were presoaked in 500μM SA solution for only 6h, after which both groups were allowed to germinate for 3d and were then grown for 14d in Hoagland solution at 22/18°C in a 16/8-h light/dark period and 120μmolm⁻²s⁻¹ PAR. All seedlings (without H₂O and SA controls) were transferred to Cd-containing solutions (10, 15, and 25μM) and grown for 14d. The rate of CO₂ fixation and the activity of ribulose 1,5-bisphosphate carboxylase (RuBPC, EC 4.1.1.39) and phosphoenolpyruvate carboxylase (PEPC, EC 4.1.1.31) were measured. Changes in the levels of several important parameters associated with oxidative stress, namely H₂O₂ and proline production, lipid peroxidation …