Table 2.
Changes in leaf relative water content, photosynthetic and chlorophyll fluorescence parameters, water use efficiency in P. zhennan for non-fertilized (-P) and fertilized (+P) treatments with and without water stress.
| Traits | Well-watered | Water-stressed | ||
|---|---|---|---|---|
| -P | +P | -P | +P | |
| LRWC (%) | 41.5 ± 1.93a | 41.7 ± 2.74a | 30.2 ± 0.89b | 36.3 ± 1.16a |
| Pn (μmol m-2 s-1) | 2.57 ± 0.11ab | 3.11 ± 0.3a | 1.24 ± 0.07c | 2.03 ± 0.29b |
| Ci (μmol mol-1) | 248.21 ± 17.16a | 249.91 ± 15.8a | 162.02 ± 10.8b | 207.88 ± 16.39ab |
| Gs (mol m-2 s-1) | 0.036 ± 0.004ab | 0.047 ± 0.0136a | 0.0093 ± 0.0003c | 0.0209 ± 0.0049bc |
| WUEintr (μmol mol-1) | 74.4 ± 11.73b | 73.17 ± 12.53b | 133.18 ± 7.17a | 101.51 ± 11.16ab |
| E (mmol m-2 s-1) | 1.51 ± 0.18ab | 1.86 ± 0.62a | 0.4 ± 0.01b | 0.89 ± 0.17ab |
| Fv/Fm | 0.81 ± 0.02a | 0.82 ± 0.02a | 0.67 ± 0.01c | 0.74 ± 0.02b |
Means followed by different letters indicate significant differences (P ≤ 0.05) among the four treatments according to Duncan’s test. Values are means ± SE.