Table 1.
Effect of different forms of N sources on the growth and anatoxin production of C. issatschenkoi after 16 days’ culture. Initial carbon/nitrogen (C/N) ratio in each treatment group was calculated and listed in the table.
| Treatments | C/N Value |
C (mM) |
N (mM) |
pH | Fv/Fm | Cell Productivity (mg Chl a L−1·d−1) |
Maximum Intracellular Anatoxins Yield (µg/mg Dry Weight [DW]) |
|---|---|---|---|---|---|---|---|
| NaNO3 | 0.107 | 0.189 | 1.765 | 9.886 ± 0.023 c | 0.471 ± 0.005 c | 0.123 ± 0.013 c | 16.572 ± 2.343 b |
| NH4Cl | 0.107 | 0.189 | 1.765 | 7.317 ± 0.038 a | 0.319 ± 0.004 b | 0.022 ± 0.003 b | 17.921 ± 0.787 b |
| Urea (CH4N2O) |
0.607 | 1.071 | 1.765 | 8.924 ± 0.054 b | 0.296 ± 0.008 b | 0.125 ± 0.014 c | 25.86 ± 1.667 c |
| L-alanine (C3H7NO2) | 3.107 | 5.483 | 1.765 | 8.985 ± 0.053 b | 0.451 ± 0.002 c | 0.140 ± 0.003 c | 20.993 ± 0.554 b |
| L-proline (C5H9NO2) | 5.107 | 9.013 | 1.765 | 7.318 ± 0.03 a | 0.143 ± 0.039 a | −0.073 ± 0.006 a | 10.003 ± 0.368 a |
a–c The values indicated by the same letter represented no significant difference, p = 0.05 by Tukey’s test.