Table 1. Light condition characteristics, and photosynthetic and biochemical properties in Pseudo-nitzschia multistriata cells.
Blue | Blue-red | Blue-red-green | Red | ||||
Low | High | Low | High | Low | High | Low | |
(B-L) | (B-H) | (BR-L) | (BR-H) | (BRG-L) | (BRG-H) | (R-L) | |
PFD | 250 | 450 | 250 | 450 | 250 | 450 | 250 |
Blue | 250 | 450 | 200 | 360 | 105 | 189 | 0 |
Green | 0 | 0 | 0 | 0 | 100 | 180 | 0 |
Red | 0 | 0 | 50 | 90 | 45 | 81 | 250 |
Red : Blue | 0 | 0 | 0.25 | 0.25 | 0.43 | 0.43 | 0 |
a* | 2.51 (0.09) | 1.46 (0.07) | 2.69 (0.22) | 2.89 (0.10) | 1.97 (0.63) | 1.22 (0.08) | 4.44 (0.05) |
PUR | 2.47 (0.09) | 2.4 (0.06) | 2.27 (0.23) | 4.39 (0.16) | 1.49 (0.51) | 1.95 (0.12) | 1.11 (0.23) |
relETRmax | 2.72 (0.13) | 1.66 (0.11) | 3.61 (0.41) | 3.45 (0.17) | 2.13 (0.57) | 1.07 (0.09) | 2.63 (0.47) |
α | 6.7 (1.1) | 3.8 (0.27) | 7.3 (0.36) | 7.1 (0.44) | 4.9 (0.96) | 3.0 (0.54) | 13 (2.2) |
Ek | 408 (66) | 431 (21) | 497 (32) | 491 (39) | 472 (37) | 363 (84) | 200 (5) |
POC | 131 (37) | 62 (8) | 80 (5) | 80 (5) | 100 (8) | 89 (5) | 154 (28) |
POC/PON | 4.9 (0.52) | 4.3 (0.63) | 4.8 (0.27) | 4.7 (0.37) | 6.2 (0.76) | 4.7 (0.05) | 2.9 (0.19) |
Chl a/POC | 8.2 (4.8) | 10.3 (2.9) | 13.8 (2.6) | 10.7 (1.5) | 9.8 (2.2) | 10.8 (0.9) | 6.2 (2.5) |
Blue, green and red fluence rates (µmol photon m−2 s−1) measured at light peak and red : blue ratio values for the different light conditions. a*×10–11, absorption coefficient (m2 cell−1); PUR×10–6, photosynthetically usable radiation (µW cell–1); relETRmax×10–6, (maximal relative rate of linear electron transport, nmol e−1 s−1 cell−1), α×10–9 (maximum light use efficiency, nmol e−1 s−1 cell−1(µmol photon m−2 s−1) −1), and Ek (light intensity for reaching relETRmax, µmol photon m−2 s−1); POC, particulate organic carbon (pg cell−1); POC/PON, particulate organic carbon (POC) to particulate organic nitrogen (PON) ratio (pg/pg); Chl a/POC×10–3, Chlorophyll a to POC ratio (pg/pg). Data represent mean and standard deviation. For a* and PUR, n = 3; For relETRmax, α and Ek, n = 6 (mean of the two days light peak measurements); For POC, PON, POC/PON and Chl a/POC, n = 21.