Table 3.
Characterising parameters of the P–E curves, relative electron transport rate as a function of irradiation, fitted according to Eilers and Peeters (1988). P–E curves were determined in the Zygnema sp. strains B, G, D and E in BBM, in 400 mM and 800 mM sorbitol solution after 3, 6 and 24 h incubation.
| BBM | 400 Sorbitol |
800 Sorbitol |
|||||
|---|---|---|---|---|---|---|---|
| 3 h | 6 h | 24 h | 3 h | 6 h | 24 h | ||
| Zygnema sp. B | |||||||
| α | 0.10 | 0.12 | 0.09 | 0.15 | 0.07 | 0.05 | 0.07 |
| rETRmax | 24.3 | 21.0 | 21.6 | 25.4 | 14.5 | 9.1 | 4.4 |
| Ek | 242.6 | 176.8 | 244.9 | 165.7 | 204.3 | 180.0 | 59.3 |
| Zygnema sp. G | |||||||
| α | 0.07 | 0.07 | 0.05 | 0.07 | 0.01 | 0.03 | 0.52 |
| rETRmax | 10.3 | 9.6 | 9.6 | 7.9 | 3.3 | 2.6 | 0.9 |
| Ek | 154.6 | 147.1 | 193.1 | 109.2 | 228.2 | 87.9 | 1.8 |
| Zygnema sp. D | |||||||
| α | 0.23 | 0.20 | 0.17 | 0.14 | 0.13 | 0.07 | 0.03 |
| rETRmax | 38.0 | 21.3 | 17.7 | 19.7 | 15.8 | 9.8 | 5.9 |
| Ek | 165.1 | 105.6 | 107.3 | 145.5 | 122.4 | 146.2 | 223.0 |
| Zygnema sp. E | |||||||
| α | 0.19 | 0.13 | 0.12 | 0.20 | 0.12 | 0.08 | 0.08 |
| rETRmax | 31.4 | 26.4 | 25.2 | 23.0 | 19.3 | 14.5 | 12.2 |
| Ek | 164.8 | 197.8 | 207.6 | 116.1 | 162.7 | 189.8 | 161.9 |
α – initial slope at low light levels (electron/photon), rETRmax – maximal relative electron transport rate (μmol electrons m−2 s−1), Ek – initial light saturation point (μmol photons m−2 s−1). These values were calculated using the results for a, b and c from the fit rETR = I/(a·I2 + b·I + c) (see Section 2).