FIGURE 3.

Gene expression level and relative carotenoid content in the carotenoid biosynthesis pathway in Klebsormidium nitens under high light (HL) and low light (LL). Expression fold change under high light compared to low light is represented for genes corresponding to the different enzymes involved in carotenogenesis in Klebsormidium nitens: phytoene synthase (PSY), phytoene desaturase (PDS), ζ-carotene desaturase (ZDS), lycopene epsilon cyclase (LCYε), lycopene beta cyclase (LCYβ), β-carotene hydroxylase (BCH), violaxanthin de-epoxidase (VDE), and zeaxanthin epoxidase (ZEP). Red squares represent strong activation whereas blue squares stand for strong repression. Barplots show relative carotenoid content under high light in red (HL) compared to low light in blue (LL).