Table 4.
F-values and P-values from two-way ANOVA for the effects of CO2 levels and N levels on the fresh weight of rice plants, total soluble protein, Bt toxin content, and Bt gene expression.
| Parameters | df | CO2 | N | CO2 × N | |||
|---|---|---|---|---|---|---|---|
| F-values | P-values | F-values | P-values | F-values | P-values | ||
| Fresh weight of aboveground parts (g) | 199 | 0.148 | 0.701 | 11.677 | 0.000*** | 1.578 | 0.182 |
| Fresh weight of belowground parts (g) | 199 | 0.003 | 0.953 | 9.252 | 0.000*** | 1.422 | 0.228 |
| Total soluble protein (mg/g leaf fresh weight) | 99 | 0.661 | 0.419 | 26.577 | 0.000*** | 14.250 | 0.000*** |
| Bt protein content (mg/g leaf fresh weight) | 99 | 13.937 | 0.000*** | 11.820 | 0.000*** | 2.475 | 0.050* |
| Bt gene expression | 29 | 0.002 | 0.969 | 26.130 | 0.000*** | 10.597 | 0.000*** |
*P < 0.05; ***P < 0.001.