Table 3.
Statistical summary
Summary of statistical analysis using three-way ANOVA for the effects of [CO2], species, and the photosynthetic type on various parameters collected for 10 grass species grown at glacial (180 μl l–1) and ambient (400 μl l–1) [CO2].
| Parameter | Main effects (P) | Interactions (P) | |||
|---|---|---|---|---|---|
| Species | Type | [CO2] | [CO2]×species | [CO2]×type | |
| Photosynthesis, Asat (μmol m–2 s–1) | 0.000 | 0.000 | 0.000 | 0.016 | 0.000 |
| Conductance, gs (mol m–2 s–1) | 0.000 | 0.000 | 0.000 | 0.110 | 0.000 |
| Intercellular [CO2], Ci (μl l–1) | 0.000 | 0.000 | 0.000 | 0.028 | 0.005 |
| PWUE [μmol (mol H2O)–1] | 0.000 | 0.000 | 0.000 | 0.694 | 0.083 |
| LMA (g m–2) | 0.000 | 0.028 | 0.000 | 0.692 | 0.378 |
| Leaf [N]mass (mg g–1) | 0.000 | 0.000 | 0.000 | 0.000 | 0.001 |
| Leaf [N]area (mmol m–2) | 0.000 | 0.000 | 0.036 | 0.039 | 0.516 |
| PNUE [mmol (mol N)–1 s–1] | 0.000 | 0.000 | 0.000 | 0.460 | 0.001 |
| Plant dry mass, PDM (g per plant) | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
| Soluble protein (g m–2) | 0.004 | 0.000 | 0.000 | 0.710 | 0.044 |
| Rubisco sites (nmol m–2) | 0.594 | 0.000 | 0.000 | 0.158 | 0.000 |
| Rubisco/soluble protein | 0.001 | 0.000 | 0.448 | 0.009 | 0.463 |
| Rubisco-N (% leaf N) | 0.006 | 0.000 | 0.407 | 0.230 | 0.000 |
| Rubisco activity (μmol m–2 s–1) | 0.000 | 0.000 | 0.000 | 0.004 | 0.000 |
| PEPC activity (μmol m–2 s–1) | 0.000 | 0.000 | 0.000 | 0.000 | 0.140 |
| NADP-ME activity (μmol m–2 s–1) | 0.000 | 0.000 | 0.340 | 0.048 | 0.461 |
| PEP-CK activity (μmol m–2 s–1) | 0.000 | 0.000 | 0.133 | 0.319 | 0.960 |
| PEPC/Rubisco | 0.000 | 0.000 | 0.003 | 0.068 | 0.579 |
| In vivo V cmax (μmol m–2 s–1) | 0.000 | 0.010 | 0.000 | 0.004 | 0.000 |
| In vivo V pmax (μmol m–2 s–1) | 0.000 | 0.000 | 0.000 | 0.000 | 0.004 |
| In vivo V p/Vc | 0.000 | 0.010 | 0.000 | 0.000 | 0.001 |