Figure 1

Growth curve under different light intensities and CO ₂ concentrations. (a) Growth curve under 0.04% CO₂; (b), 1% CO₂; (c), 2% CO₂; and (d), 4% CO₂. Light intensities are 50 (circles), 300 (squares), and 600 μmol photons m⁻² s⁻¹ (diamonds). Error bars indicate standard deviations (SD) of three replicated experiments. In some data points, error bars obtained by three replications are smaller than symbols.