Fig. 2

The photosynthetic CO₂ uptake rates (P_n) under different photosynthetic photon flux densities in flag leaves at different developmental stages. a Early milk stage, b Late milk stage. The CO₂ concentrations used during the measurements were 380–400 ppm and 385 ppm for early milk stage and late milk stage respectively. The photosynthetic CO₂ uptake rates under different intercellular CO₂ concentration in flag leaves for YLY1 (c) and LYP9 (d) measured at the milk stage. During the measurements, the PPFD used was 1600 μmolm^− 2 s^− 1. The bar is the standard deviations of 3 replicates