Table 1a.
Changes of photosynthetic parameters in well-watered (Control) and drought stressed (Stress) tobacco wild-type (WT) plants throughout the experiment
| WW | S1 | S4 | R1 | R2 | R5 | ||
| RWCm | 77.5±1.1 a | 75.1±3.1 a | 61.7±2.1 b | 78.9±1.1 a | – | 79.8±4.0 a | |
| Vc,max | Control | 166.0±28.5 a | – | 138.1±26.7 a | – | – | 124.0±10.4 ab |
| Stress | 159.7±12.5 a | 112.5±9.1 ab | 139.7±17.0 a | 160.9±5.1 a | 162.1±11.6 a | ||
| Jmax | Control | 200.3±19.1 a | – | 183.2±22.1 a | – | – | 170.1±10.4 a |
| Stress | 136.4±9.6 b | 104.4±10.0 b | 174.0±13.7 a | 203.3±7.7 a | 203.7±10.7 a | ||
| qP | Control | 0.58±0.02 a | 0.48±0.02 ab | 0.45±0.09 ab | 0.46±0.09 a | 0.42±0.09 ab | 0.42±0.08 b |
| Stress | 0.44±0.03 b | 0.17±0.06 c | 0.41±0.10 b | 0.57±0.02 a | 0.55±0.03 a | ||
| Cc(Vc,max//Jmax) | Control | 153.8±9.3 a | – | 155.7±1.4 a | – | – | 146.0±11.7 |
| Stress | 85.4±4.6 b | 72.1±6.6 b | 104.3±4.8 b | 124.3±8.7 ab | 149.0±5.9 a |
RWCm, Vc,max, Jmax, qP, and Cc denote for relative leaf water content at midday, maximum carboxylation rate, maximum photosynthetic electron transport rate, photochemical quenching of PSII, and chloroplast CO2 concentration at the turning point of Rubisco (Vc,max) and RuBP (Jmax) limitation to photosynthesis, respectively. Means and standard errors of at least four measurements are presented for well-watered condition (WW), first (S1), and last day (S4) of severe drought stress, as well as for the first (R1), second (R2), and fifth day (R5) of rewatering. For each parameter statistically significant differences to the control value (WW) are indicated by different letters (P <0.05).