Table 5.
Temperature responses of leaf hydraulic parameters under two N supplies at different growth stages.
| Growth Stage | N Supply | Leaf Temperature (°C) | Ψleaf (MPa) |
Kleaf (mmol m−2 s−1 MPa−1) |
|---|---|---|---|---|
| Mid-tillering | N0 | 15 | −0.293 ± 0.087 a | 8.57 ± 1.11 a |
| 25 | −0.285 ± 0.090 a | 7.86 ± 1.80 a | ||
| 35 | −0.423 ± 0.097 b | 7.05 ± 1.56 a | ||
| HN | 15 | −0.360 ± 0.099 a | 11.39 ± 2.53 a | |
| 25 | −0.430 ± 0.114 a | 10.71 ± 1.45 a | ||
| 35 | −0.370 ± 0.106 a | 10.13 ± 2.58 a | ||
| Booting | N0 | 15 | −0.155 ± 0.064 a | 7.48 ± 2.25 a |
| 25 | −0.278 ± 0.068 b | 5.98 ± 1.78 a | ||
| 35 | −0.560 ± 0.140 c | 6.03 ± 1.55 a | ||
| HN | 15 | −0.395 ± 0.137 a | 8.83 ± 1.16 a | |
| 25 | −0.310 ± 0.081 a | 9.20 ± 2.17 a | ||
| 35 | −0.425 ± 0.044 a | 9.59 ± 1.38 a | ||
| ANOVA | ||||
| T | *** | ns | ||
| N | ns | *** | ||
| S | ns | ** | ||
| T × N | *** | ns | ||
| T × S | * | ns | ||
| N × S | ns | ns |
Data are means ± SD of 4–7 replicates. *, p < 0.05; **, p < 0.01; ***, p < 0.001; ns, non-significant. S represents growth stage. Ψleaf, leaf water potential; Kleaf, the normalised leaf hydraulic conductance with water viscosity. The data followed by different letters in the same N and growth stages are significant at p < 0.05 level.