TABLE 1.
Phenotypical analysis of gun4 mutant in comparison to the wild type
Values represent the mean ± S.D. of at least three independent experiments using different cultures harvested in logarithmic growth phase.
|
Strain |
Low light
intensitya |
Medium light
intensityb |
||
|---|---|---|---|---|
| Wild type | gun4- | Wild type | gun4- | |
| Doubling time (h) | 19 ± 0.5 | 21 ± 0.5 | 10 ± 0.2 | 25 ± 0.5 |
| Chlorophyll (μg·mg protein-1) | 11.3 ± 1.1 | 2.7 ± 0.2 | 11.8 ± 1.0 | 0.9 ± 0.4 |
| Phycocyanin (μg·mg protein-1) | 153 ± 36 | 154 ± 32 | 163 ± 45 | 131 ± 43 |
| Protoporphyrin IX (pmol·mg protein-1) | 17.2 ± 10.9 | 61.6 ± 51.2 | 4.7 ± 2.0 | 205.0 ± 100 |
| Mg-protoporphyrin IX (pmol·mg protein-1) | 1.17 ± 0.46 | 0.15 ± 0.06 | 1.00 ± 0.22 | 0.16 ± 0.06 |
| Mg-protoporphyrin IX monomethyl ester (pmol·mg protein-1) | 4.51 ± 0.87 | 0.98 ± 0.51 | 3.88 ± 1.12 | 0.72 ± 0.33 |
a
5 μmol of photons m-2 s-1 in medium containing 5 mm glucose.
b
50 μmol of photons m-2 s-1 in medium containing 5 mm glucose.