Table 2.
Photosynthesis rate and evaporation rate measured at 1500 μmol m−2 s−1 of PPFD (A1500, E1500) and surface area of chloroplasts facing intercellular airspaces (Sc) on a leaf-area basis, whole-leaf basis, and tree basis.
| Parameter | Genotype | |
|---|---|---|
| GUT5 (control) | EcHB1-2 (transgenic) | |
| Tree basis | ||
| A1500 (μmol s−1) | 3.15 (0.24) | 2.70 (0.19)n.s. |
| E1500 (mmol s−1) | 1.11 (0.08) | 0.68 (0.05)*** |
| Sc (m2) | 3.35 (0.25) | 3.26 (0.23)n.s. |
| Whole-leaf basis | ||
| Leaf area × A1500 (μmol s−1) | 0.0271 (0.002) | 0.0192 (0.008)** |
| Leaf area × E1500 (μmol s−1) | 9.54 (0.69) | 4.87 (0.2)*** |
| Leaf area × Sc (10−3 m2) | 28.8 (2.1) | 23.2 (0.9)* |
| Leaf-area basis | ||
| A1500 (μmol m−2 s−1) | 8.59 (0.21) | 12.0 (0.28)*** |
| E1500 (mmol m−2 s−1) | 3.03 (0.19) | 3.04 (0.15)n.s. |
| Sc (m2 m−2) | 9.1 (0.7) | 14.5 (0.4)*** |
Mean values with standard errors in parenthesis are shown. Fully-expanded mature leaves (n = 4–6) and 8-month-old trees (n = 15–16) were used for the analysis. Significant levels of differences between GUT5 and EcHB1-2 were tested by Welch’s t-test with *P < 0.05, **P < 0.01 and ***P < 0.001. n.s. means no significant difference (P > 0.1).