Fig. 3From: Suppression of the phytoene synthase gene (EgcrtB) alters carotenoid content and intracellular structure of Euglena gracilis 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)Back to article page