Table 2.
Gas exchange in Vigna unguiculata plants splayed with EBR and exposed to water deficit
| Water condition | EBR (nM) | P N (µmol m−2 s−1) | E (mmol m−2 s−1) | G s (mol m−2 s−1) | C i (µmol mol−1) | WUE (µmol mmol−1) | P N/C i (µmol m−2 s−1 Pa−1) |
|---|---|---|---|---|---|---|---|
| Control | 0 | 15.6 ± 0.5Ca | 3.38 ± 0.02Aa | 0.37 ± 0.02Aa | 247 ± 15Ab | 4.62 ± 0.12Ca | 0.063 ± 0.005Ba |
| Control | 50 | 17.0 ± 0.7Ba | 3.38 ± 0.05Aa | 0.36 ± 0.01Aa | 247 ± 20Ab | 5.03 ± 0.15Ba | 0.065 ± 0.004Ba |
| Control | 100 | 19.2 ± 0.4Aa | 3.46 ± 0.07Aa | 0.38 ± 0.02Aa | 247 ± 17Aa | 5.55 ± 0.16Aa | 0.078 ± 0.006Aa |
| Water deficit | 0 | 5.2 ± 0.2Cb | 1.42 ± 0.09Bb | 0.09 ± 0.01Bb | 303 ± 10Aa | 3.88 ± 0.18Cb | 0.017 ± 0.001Cb |
| Water deficit | 50 | 8.0 ± 0.4Bb | 1.67 ± 0.09Ab | 0.12 ± 0.01Ab | 272 ± 15Ba | 4.81 ± 0.22Ba | 0.029 ± 0.003Bb |
| Water deficit | 100 | 10.2 ± 0.5Ab | 1.76 ± 0.08Ab | 0.12 ± 0.01Ab | 249 ± 22Ba | 5.80 ± 0.31Aa | 0.041 ± 0.003Ab |
P N Net photosynthetic rate; E Transpiration rate; g s Stomatal conductance; C i Intercellular CO2 concentration; WUE Water-use efficiency; P N/C i Carboxylation instantaneous efficiency. Columns with different uppercase letters between EBR levels (0, 50 and 100 nM EBR under equal water condition) and lowercase letters between water conditions (control and water deficit under equal EBR concentration) indicate significant differences from the Scott–Knott test (P < 0.05). Values described corresponding to means from five repetitions and standard deviations