Table 2.
Net photosynthesis, gas exchanges, and leaf temperature of NA5858RR drought-sensitive genotype inoculated with different Bradyrhizobium strains, submitted to moderate water restriction (during 10 days) and severe (during 7 days), between 45 and 62 days after emergence
| Net photosynthetic rates, A (μmol CO2 m−2 s−1) | ||||||
| Moderate water restriction | Severe water restriction | |||||
| Strain | Dry | Wet | Average | Dry | Wet | Average |
| SEMIA 587 | 17.1 | 19.4 | 18.2 ab | 0.22 aB | 16.1 abA | 8.13 |
| SEMIA 5019 | 17.0 | 17.7 | 17.2 b | 0.07 aB | 15.3 bA | 7.68 |
| SEMIA 5080 | 19.3 | 20.3 | 19.8 a | − 0.23 aB | 16.8 aA | 8.30 |
| Average | 17.8 A | 19.1 A | 0.02 | 16.1 | ||
| Transpiration rates, E (mmol H2O m−2 s−1) | ||||||
| Moderate water restriction | Severe water restriction | |||||
| Strain | Dry | Wet | Average | Dry | Wet | Average |
| SEMIA 587 | 2.99 | 3.36 | 3.18 a | 0.02 | 3.82 | 1.92 a |
| SEMIA 5019 | 3.08 | 3.32 | 3.20 a | 0.09 | 3.46 | 1.78 a |
| SEMIA 5080 | 3.47 | 3.57 | 3.52 a | 0.15 | 4.00 | 2.10 a |
| Average | 3.18 A | 3.42 A | 0.09 B | 3.76 A | ||
| Stomatal conductance, gs (mol H2O m−2 s−1) | ||||||
| Moderate water restriction | Severe water restriction | |||||
| Strain | Dry | Wet | Average | Dry | Wet | Average |
| SEMIA 587 | 0.281 | 0.443 | 0.362 a | 0.000 | 0.378 | 0.19 a |
| SEMIA 5019 | 0.289 | 0.382 | 0.335 a | 0.003 | 0.399 | 0.20 a |
| SEMIA 5080 | 0.290 | 0.455 | 0.372 a | 0.003 | 0.390 | 0.20 a |
| Average | 0.287 B | 0.427 A | 0.002 B | 0.389 A | ||
| Intercellular CO2 concentration, Ci (μmol CO2 mol−1) | ||||||
| Moderate water restriction | Severe water restriction | |||||
| Strain | Dry | Wet | Average | Dry | Wet | Average |
| SEMIA 587 | 273 | 330 | 301 a | 283 bA | 302 aA | 293 |
| SEMIA 5019 | 271 | 315 | 293 a | 387 aA | 279 aB | 334 |
| SEMIA 5080 | 283 | 309 | 296 a | 231 cB | 279 aA | 255 |
| Average | 276 B | 318 A | 300 | 287 | ||
| Temperature of leaves (°C) | ||||||
| Moderate water restriction | Severe water restriction | |||||
| Strain | Dry | Wet | Average | Dry | Wet | Average |
| SEMIA 587 | 29.7 | 28.6 | 29.2 a | 34.2 | 29.8 | 32.0 a |
| SEMIA 5019 | 30.8 | 28.9 | 29.8 a | 34.4 | 29.9 | 32.2 a |
| SEMIA 5080 | 29.8 | 28.8 | 29.3 a | 34.5 | 29.7 | 32.1 a |
| Average | 30.1 A | 28.8 B | 34.3 A | 29.8 B | ||
Means followed by the same letter, capital in lines and small in columns, do not differ from one another (Tukey, p < 0.05) (n = 6). Comparison within each factor level denotes significant interaction; comparison in the average of one factor denotes isolated effect