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The effect of ectomycorrhizal Pisolithus tinctorius (Pt) infection was studied on the growth and photosynthetic characteristics of Pinus densiflora seedlings grown at ambient (360 µmol mol⁻¹, AC) and elevated (720 µmol mol⁻¹, EC) CO₂ concentrations. After 18 weeks, Pt inoculation had led to significantly increased dry mass and stem diameter of P. densiflora at both CO₂ concentrations, relative to non-inoculated seedlings. Moreover, EC significantly increased the ectomycorrhizal development. The phosphate content in needles inoculated with Pt was about three times higher than without inoculation at both CO₂ concentrations. The PAR saturated net photosynthetic rates (P _sat) of P. densiflora inoculated with Pt were clearly higher than for control seedlings at both CO₂ concentrations, and the maximum net photosynthetic rate (P _N) at saturated CO₂ concentration (P _max) was higher than in controls …