Figure 1.

Growth and pigmentation of cells cultivated under HC (5% CO₂) or LC (0.035% CO₂) conditions. A, Growth rates after cultivation under HC conditions, 24 h after shifting HC precultivated cells to LC, or after long-term LC acclimation. B, Pigmentation ratios of phycocyanin (PC) and carotenoids (Car) relative to chlorophyll a (Chl a) in HC-grown (dark gray columns) and long-term LC-acclimated (light gray columns) cells. Mean values and sd are shown. A statistically significant difference of mutant data in comparison with wild-type data (WT) is indicated by the asterisk (P ≤ 0.05).