Table 1.
Chlorophyll fluorescence in Vigna unguiculata plants splayed with EBR and exposed to water deficit
| Water condition | EBR (nM) | ΦPSII | QP | NPQ | ETR (µmol m−2 s−1) | EXC (µmol m−2 s−1) | ETR/P N |
|---|---|---|---|---|---|---|---|
| Control | 0 | 0.40 ± 0.03Ba | 0.79 ± 0.06Ba | 0.82 ± 0.07Ab | 59.0 ± 5.1Ba | 0.47 ± 0.03Ab | 3.81 ± 0.29Ab |
| Control | 50 | 0.42 ± 0.01Ba | 0.86 ± 0.05Ba | 0.79 ± 0.07Ab | 62.3 ± 3.4Ba | 0.46 ± 0.03Ab | 3.65 ± 0.16Ab |
| Control | 100 | 0.46 ± 0.02Aa | 0.97 ± 0.04Aa | 0.78 ± 0.06Ab | 68.7 ± 2.2Aa | 0.44 ± 0.02Ab | 3.57 ± 0.14Ab |
| Water deficit | 0 | 0.19 ± 0.01Cb | 0.25 ± 0.04Cb | 1.51 ± 0.11Aa | 28.5 ± 0.8Cb | 0.68 ± 0.01Aa | 5.45 ± 0.18Aa |
| Water deficit | 50 | 0.27 ± 0.01Bb | 0.37 ± 0.06Bb | 1.09 ± 0.05Ba | 39.9 ± 1.6Bb | 0.61 ± 0.03Ba | 4.98 ± 0.21Ba |
| Water deficit | 100 | 0.33 ± 0.02Ab | 0.53 ± 0.06Ab | 1.06 ± 0.04Ba | 49.0 ± 3.0Ab | 0.55 ± 0.03Ca | 4.81 ± 0.24Ba |
Φ PSII Effective quantum yield of PSII photochemistry; q P Photochemical quenching coefficient; NPQ Nonphotochemical quenching; ETR Electron transport rate; EXC Relative energy excess at the PSII level; ETR/P N Ratio between the electron transport rate and net photosynthetic rate. 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