Table 3.
Summary of statistics for plant dry mass (DM) and morphological parameters
| Time point | Parameter (mean per plant) | Main effects | Interaction | |
|---|---|---|---|---|
| CO2 | HS | CO2×HS | ||
| 13 WAP (T1) | Tiller number | ** | ||
| Leaf number | *** | |||
| Leaf area (cm2) | *** | |||
| Ear number | *** | |||
| Ear DM (g) | *** | |||
| Leaf DM (g) | *** | |||
| Stem DM (g) | *** | |||
| Roots DM (g) | NS | |||
| Shoot DM (g) | *** | |||
| Total DM (g) | *** | |||
| 17 WAP (T2) | Tiller number | *** | *** | *** |
| Leaf number | *** | *** | *** | |
| Leaf area (cm2) | *** | NS | ** | |
| Ear number | *** | *** | *** | |
| Ear DM (g) | *** | *** | NS | |
| Leaf DM (g) | *** | *** | *** | |
| Stem DM (g) | *** | *** | *** | |
| Roots DM (g) | *** | ** | * | |
| Shoot DM (g) | *** | *** | NS | |
| Total DM (g) | *** | *** | NS | |
| 25 WAP (T3) | Ear number | *** | *** | * |
| Ear DM (g) | *** | *** | NS | |
| Roots DM (g) | NS | *** | NS | |
| Shoot DM (g) | *** | *** | ** | |
| Total DM (g) | *** | NS | NS | |
| Main stem grain yield (g) | NS | *** | NS | |
| Grain yield (g) | *** | *** | NS | |
| Grain number | ** | *** | NS | |
| Grains per ear | NS | *** | NS | |
| Grain size (mg per grain) | ** | *** | NS | |
| Harvest index | ** | *** | * |
Summary of statistical analysis using two-way ANOVA for the effects of elevated CO2 and heat stress (HS) on biomass and morphological parameters for plants harvested at various time points (n=9–10). Significance levels are *** P <0.001; **P<0.01; *P<0.05; NS, P>0.05