Table 1.
Biomass and lipid (TAG) productivity and content in diatoms grown at different CO2 concentration.
| Diatom Species | Growth Phase | CO2 Concentration (ppm) | Biomass Productivity (mg L−1 day−1) * | TAG Productivity (µgTAG L−1 day−1) * | Percentage of TAGs (DW) * |
|---|---|---|---|---|---|
| T. pseudonana | Exponential | 400 | 61.7 ± 7.0 | 11.8 ± 3 | 2.3 ± 1.0 |
| 20,000 | 68.6 ± 9.0 | 45.5 ± 26 | 5.3 ± 4.2 | ||
| Stationary | 400 | 45.3 ± 3.0 | 13.6 ± 2 | 5.5 ± 3.3 | |
| 20,000 | 55.8 ± 2.0 b↑ | 19.0 ± 5 | 7.2 ± 5.3 | ||
| P. tricornutum | Exponential | 400 | 28.5 ± 4.0 | 3.36 ± 1 | 0.67 ± 0.65 |
| 20,000 | 36.7 ± 6.0 | 8.47 ± 7 | 1.2 ± 1.4 | ||
| Stationary | 400 | 51.0 ± 4.0 | 50.2 ± 15 | 10.1 ± 3.6 | |
| 20,000 | 56.9 ± 1.0 | 75.7 ± 9 | 13.5 ± 1.3 | ||
| N. pelliculosa (seawater) | Exponential | 400 | 40.7 ± 4.0 | 0.03 ± 1 | - |
| 20,000 | 49.3 ± 3.0 a↑ | 1.09 ± 1 | 0.22 ± 0.2 | ||
| Stationary | 400 | 48.8 ± 5.0 | 117.4 ± 12 | 25.7 ± 3.0 | |
| 20,000 | 58.6 ± 1.0 b↑ | 158.4 ± 29 b↑ | 27.0 ± 0.8 | ||
| N. pelliculosa (freshwater) | Exponential | 400 | 42.8 ± 13.0 | 44.9 ± 10 | 11.5 ± 5.0 |
| 20,000 | 47.6 ± 12.0 | 55.8 ± 6 | 12.0 ± 1.8 | ||
| Stationary | 400 | 45.1 ± 8.0 | 142.3 ± 12 | 32.0 ± 5.0 | |
| 20,000 | 38.2 ± 1.0 | 97.25 ± 5 b↓ | 25.5 ± 0.7 | ||
| A. formosa | Exponential | 400 | 6.4 ± 1.0 | 1.43 ± 0.4 | 2.2 ± 0.3 |
| 20,000 | 5.6 ± 2.0 | 1.08 ± 1.7 | 1.4 ± 2.0 | ||
| Stationary | 400 | 2.3 ± 1.0 | 0.01 ± 0.003 | 0.06 ± 0.01 | |
| 20,000 | 2.5 ± 4.0 | 0.40 ± 0.8 | 1.7 ± 0.3 |
* All data is shown as average (n = 3) ± SD. a Significant difference between high and low CO2 in diatoms at exponential phase for a given species. b Significant difference between high and low CO2 in diatoms at stationary phase for a given species. ↑ and ↓ indicate increase or decrease, respectively. DW: Dry weight.