Fig. 2

Transcript levels of genes encoding components involved in carotenoid biosynthesis in wild-type P. tricornutum. a Genes involved in fucoxanthin biosynthesis. b Transcriptional fold changes in strain CCMP631 (Pt6) relative to strain CCMP2561 (Pt1). c Relative VDL1 mRNA levels in strains Pt1 and Pt6. Abbreviations: DXS, 1-deoxy-D-xylulose 5-phosphate synthase; PSY, phytoene synthase; GGDS, geranylgeranyl diphosphate synthase; PDS, phytoene desaturase; ZDS, ζ-carotene desaturase; LCYB, lycopene β-cyclase; LUTL, lutein deficient-like; ZEP, zeaxanthin epoxidase; VDE, violaxanthin de-epoxidase; VDL, violaxanthin de-epoxidase-like; VDR, VDE-related; CRTISO5, carotenoid isomerase 5. * and ** indicate statistically significant differences of P < 0.05 and P < 0.01, respectively