Figure 4.

Response of CO₂ assimilation rate of flag leaves at full heading to intercellular CO₂ concentration. Plants of “Koshihikari” (circles), NIL(CAR8) (triangles), and “Habataki” (squares) were grown outdoors in 12-L pots. Leaf gas exchange was measured at a PPFD of 2000 μmol photons m⁻² s⁻¹ and an air temperature of 30°C. CO₂ assimilation rate limited by RuBP carboxylation (solid line) and CO₂ assimilation rate limited by RuBP regeneration (dotted line) were shown. Curve fitting was described in the Materials and Methods Section. The straight lines represent the measurement at ambient CO₂ concentration of 370 μmol mol⁻¹. Error bars indicate SD (n = 6).