Table 8.
Photosynthesis indices of Panax notoginseng seedlings in different grades and growth stages
| Time (d) | Grade | Net photosynthetic rate [μmol/(m2 s)] | Transpiration rate [mmol/(m2 s)] | Stomatal conductance [mmol/(m2 s)] | Intercellular CO2 concentration (μL/L) | Water use efficiency in leaf |
|---|---|---|---|---|---|---|
| 60 | Special | 3.265 ± 2.02 | 0.286 ± 0.35 | 13.06 ± 2.41 | 235.6 ± 9.33 | 11.42 ± 1.07 |
| Premium | 2.243 ± 1.06 | 0.266 ± 0.32 | 12.98 ± 2.83 | 277.1 ± 10.8 | 8.43 ± 1.43 | |
| Standard | 1.996 ± 0.90 | 0.234 ± 0.29 | 12.78 ± 0.99 | 304.9 ± 13.19 | 8.52 ± 1.10 | |
| 150 | Special | 5.941 ± 2.06 | 0.479 ± 0.39 | 19.74 ± 2.05 | 207.8 ± 8.12 | 12.41 ± 1.12 |
| Premium | 3.892 ± 0.93 | 0.409 ± 0.18 | 19.32 ± 2.51 | 256.5 ± 12.8 | 9.52 ± 1.37 | |
| Standard | 2.269 ± 1.11 | 0.291 ± 0.11 | 18.98 ± 1.77 | 296.8 ± 13.86 | 7.79 ± 1.56 | |
| 240 | Special | 6.911 ± 0.52 | 0.527 ± 0.06 | 19.71 ± 1.93 | 185.9 ± 11.08 | 13.11 ± 1.81 |
| Premium | 4.227 ± 0.33 | 0.423 ± 0.13 | 18.82 ± 1.75 | 228.4 ± 15.90 | 9.99 ± 1.53 | |
| Standard | 2.655 ± 0.36 | 0.332 ± 0.03 | 18.57 ± 1.49 | 267.8 ± 18.56 | 8.01 ± 1.03 |