Figure 2. Effects of elevated CO2 and Kinetin on the grain filling percentage of Koshihikari and Takanari. Grain filling percentage was defined as the ratio of total hulled grain yield to the sink capacity. CO2 concentrations are indicated by EC and AC for elevated and ambient, respectively. KN and CN indicate exogenous application of Kinetin and control. Bars indicate the SEM (n = 4). Significant effects of each factor were indicated by ***, P < 0.001; The value indicates the probability between 0.05 and 0.1; ns, no signifance.