LAUSR

Abstract One-year-old potted Vitis vinifera L. cv. Cabernet Sauvignon grapevines were used to analyze the interaction effects of light and O 3 (ozone). Thirteen combinations of different O 3 concentrations and light intensities derived from design expert response surface software were conducted, and the result showed that light and O 3 , both individually and together, significantly decreased the F v /F m of leaves, providing a regression equation of Y ( F v /F m ratio) = 0.73 − 0.034* A (O 3 concentration) − 0.022* B (light intensity) − 0.018* A * B  − 5.163*10 −3 * A 2  + 8.375*10 −4 * B 2 . An F v /F m value of 0.711 was used as target for model validation, which was used for the obtained 30 O 3 concentration and light intensity combinations. Values of 1220 μmol m −2  s −1 light intensity + 100 nL/L O 3 and 1400 μmol m −2  s −1 light intensity + 117 nL/L O 3 treatment were selected to validate the model, and the model was validated. This model is constructed as a possible approach to forecast for leaf injury under different O 3 concentrations and light intensity combinations. Using this equation, light intensity that is likely to injure the leaves of Cabernet Sauvignon can be calculated under different O 3 concentrations. According to the Chinese new national standard, 93.46 nL/L O 3 is considered the pollution criterion; thus, the leaves of Cabernet Sauvignon were likely injured at light intensity above 1600 μmol m −2  s −1 , suggesting that a protective canopy should be used when light intensity is above this value.