Table 2.
Main effects of rootstock (sour orange (SO) and Volkamer lemon (Vol)) and NaCl salinity on leaf relative water content (RWC), chlorophyll content index (SPAD), stomatal resistant, proline content and chlorophyll fluorescence (Fv/Fm).
| Rootstock | Salinity (dS·m−1) | RWC (%) | SPAD | Stomatal resistance (s·cm−1) | Proline (μmole·g−1 FW) | Fv/Fm |
|---|---|---|---|---|---|---|
| SO | 74.6 a | 48.0 a | 8.2 b | 9.20 b | 0.44 b | |
| Vol | 69.6 b | 38.6 b | 12.9 a | 11.0 a | 0.53 a | |
| 0.7 | 90.6 a | 77.5 a | 3.7 d | 6.80 de | 0.53 a | |
| 2.0 | 85.2 ab | 63.9 a | 4.2 d | 7.80 d | 0.51 ab | |
| 4.0 | 78.2 b | 47.2 b | 6.4 d | 10.9 c | 0.49 b | |
| 8.0 | 69.4 c | 30.1 c | 12.4 c | 11.5 b | 0.46 c | |
| 12.0 | 60.0 d | 18.8 cd | 24.8 a | 13.6 a | 0.46 c | |
| 15.0 | 49.3 e | 6.2 d | 19.5 b | na | Na | |
| p-value | Rootstock (R) | 0.004 | 0.002 | <0.0001 | <0.0001 | 0.03 |
| Salinity (S) | <0.0001 | <0.0001 | <0.0001 | <0.0001 | 0.04 | |
| R × S | 0.38 | 0.32 | 0.11 | 0.21 | 0.43 |
Values in columns followed by different letters indicate significant differences between treatments at p < 0.05. Data represents mean of 24 seedlings for each rootstock and 8 seedlings for each salinity level.