Table I. COS versus CO2 uptake fluxes; simple (As/Ac) or normalized (LRU = As/Ac × ([CO2]/[COS]) ratio of COS and CO2 uptake rates, and COS total conductance under maximum-intensity light, for C4 and C3 plants.
Gas exchange conditions during the light response experiments were T approximately 24°C, RH approximately 70%, [COS] approximately 550 pmol mol−1, and [CO2] = 400 μmol mol−1; two to five replicates per species; sd is indicated in parentheses.
| Plant Species | As/Ac | LRU | As | Ac | gts |
| μmol mol−1 | pmol m−2 s−1 | μmol m−2 s−1 | mol m−2 s−1 | ||
| C4 | |||||
| Maize | 1.97 (0.50) | 1.05 (0.76) | 42.33 (3.65) | 16.23 (5.04) | 0.17 (0.18) |
| Sorghum | 1.91 (0.39) | 1.05 (0.44) | 34.10 (13.91) | 20.20 (4.18) | 0.09 (0.06) |
| Amaranthus | 2.51 (0.85) | 1.37 (0.79) | 41.54 (10.38) | 17.48 (3.72) | 0.13 (0.04) |
| Average | 2.13 (0.33) | 1.16 (0.18) | 39.32 (4.54) | 17.97 (2.03) | 0.13 (0.04) |
| C3 | |||||
| Tobacco | 2.61 (0.96) | 1.63 (0.36) | 27.01 (4.89) | 9.41 (2.08) | 0.1 (0.03) |
| Sage | 2.67 (1.11) | 1.82 (0.89) | 40.80 (24.38) | 13.50 (5.71) | 0.05 (0.03) |
| Hibiscus | 2.87 (1.28) | 2.02 (0.29) | 40.23 (12.68) | 9.91 (1.25) | 0.07 (0.02) |
| Average | 2.72 (0.14) | 1.82 (0.20) | 36.01 (13.98) | 10.94 (3.01) | 0.07 (0.03) |