Fig. 4.
Bar charts: the factors line, CO2, N fertilization, and heat wave influencing the yield-related traits grain yield, ears per pot, grain number per pot, grain number per ear, and harvest index in line HOSUT and wild-type Certo. Bars represent the mean across all other treatments and are means ±SE, n=48, significant differences according to four-way ANOVA, *P<0.05; **P<0.01, ***P<0.001. Line plots: significant interactions between the factors line:CO2 and line:N fertilization, data points are means ±SE, n=24. (This figure is available in colour at JXB online.)