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.

From: Overexpressing the HD-Zip class II transcription factor EcHB1 from Eucalyptus camaldulensis increased the leaf photosynthesis and drought tolerance of Eucalyptus

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)***

  1. 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).
Back to article page