Table 1.
Levels of Drought Condition | Treatment | Leaf Photosynthetic Rate (μmol CO2 /m2/s) | Stomatal Conductance (mol H2O /m2/s) | Transpiration (mmol H2O/m2/s) | Water Use Efficiency (μmol CO2 /mmol H2O) |
---|---|---|---|---|---|
Level 1 (Before drought treatment) | Control | 23.31 ± 4.59 A | 0.14 ± 0.03 A | 4.44 ± 1.13 A | 5.40 ± 0.99 A |
Drought | 22.54 ± 3.97 A | 0.14 ± 0.03 A | 4.25 ± 1.03 A | 5.46 ± 0.99 A | |
Level 2 (28 days drought) | Control | 22.02 ± 4.06 A | 0.15 ± 0.03 A | 5.38 ± 1.23 A | 4.16 ± 0.56 A |
Drought | 16.62 ± 5.82 B | 0.12 ± 0.05 B | 4.51 ± 1.54 B | 3.77 ± 0.75 B | |
Level 3 (28 days drought + 1 day re-watering) | Control | 18.98 ± 4.93 A | 0.12 ± 0.03 A | 3.64 ± 0.87 A | 5.21 ± 0.64 A |
Drought | 15.10 ± 4.99 B | 0.10 ± 0.03 B | 2.67 ± 0.93 B | 5.83 ± 1.33 B | |
Level 4 (28 days drought + 3 days re-watering) | Control | 12.48 ± 2.91 A | 0.18 ± 0.06 A | 2.21 ± 0.64 A | 5.80 ± 0.82 A |
Drought | 11.54 ± 4.2 A | 0.15 ± 0.05 B | 2.0 ± 0.67 A | 5.80 ± 0.86 A |
Data are represented by the means of all the replicate plants. Within the same level of drought treatments, the means in the same column followed with the same number (A, or B) are not significantly different between drought-treated and control groups (p < 0.01) when tested using ANOVA.