Figure 6.

Photosynthetic rate of transgenic rice plants. A, Dependence on C_i of photosynthetic CO₂ assimilation rate. The CO₂ assimilation was measured at PPFD of 1,500 μmol m⁻²s⁻¹, leaf temperature of 27°C, 21% O₂, vapor pressure deficit of 1.0 to 1.2 kPa, and CO₂ partial pressures of 4.5 to 88 Pa. Uppermost fully expanded leaves at vegetative growth stage (40–42 d after transplanting) of five independent plants for each lines were used for the experiments. B, Initial slope of CO₂ assimilation rate as a function of C_i. The slope was calculated by the data of Figure 6A. C, The J_max/V_cmax ratio. V_cmax and J_max were estimated by the data of Figure 6A and kinetic parameters obtained in this study (summarized in Supplemental Table S1) using the equation of von Caemmerer and Farquhar (1981). NT, Nontransgenic rice; SS5, SS16, transgenic rice that express sorghum RbcS. One-way ANOVA: **P < 0.01.