Fig. 3.
Effects of light intensity on carotenoid content of E. gracilis cells. Cells were grown under the indicated light intensities for 7 days. Relative carotenoid content per cell was calculated by normalizing molar ratios of major carotenoid species to chlorophyll a content. β, β-carotene; Neo, neoxanthin; Ddx, diadinoxanthin; Dtx, diatoxanthin. Levels of carotenoids per cell are expressed relative to total carotenoids in the cells illuminated at the standard light intensity of 55 μmol m−2 s−1. Error bars indicate ± SD of biological triplicates. Bars labeled with the same letter are not significantly different (Tukey’s multiple range test, P < 0.05)