Table II.
Photosynthetic response to light and DIC and dark respiration rates
The experiments were carried out on C. reinhardtii cells cultured at ambient [CO2] in the presence of 0.1, 1, or 10 mm NH4+. The values in parentheses indicate the sds obtained from the analysis of three cultures.
| Measurements
|
[NH4+] in the Growth Medium
|
||
|---|---|---|---|
| 0.1 mm | 1.0 mm | 10 mm | |
| Pmax (pmol O2 cell-1 h-1) | 0.06 (0.01) | 0.20 (0.01) | 0.34 (0.05) |
| Slope (DIC) (pmol O2 cell-1 h-1 mmol-1 DIC) | 2.98 (1.48) | 20.5 (2.83) | 42.6 (0.51) |
| K1/2(DIC) (μm) | 19.6 (0.05) | 9.80 (2.70) | 7.82 (1.55) |
| DIC saturation point (μm) | 41.7 (6.03) | 150 (50.0) | 214 (43.8) |
| DIC compensation point (μm) | 1.41 (0.51) | 1.90 (0.35) | 2.62 (0.40) |
| Dark respiration rate (pmol O2 cell-1 h-1) | 0.05 (0.01) | 0.07 (0.01) | 0.12 (0.01) |