Fig. 5

Effects of light intensity on growth and zeaxanthin production in zeaxanthin-accumulating mutants of C. reinhardtii. a–c Growth of the wild type, ZEP, and dzl cultured in TAP media at 25 °C under (a) low light (60 μmol photons m^–2 s^–1), b moderate light (200 μmol photons m^–2 s^–1), or (c) high light (400 μmol photons m^–2 s^–1). The initial cell concentration was 10⁶ cells mL⁻¹. Values represent the mean and standard error of two independent experiments. d Biomass production under three different light of each strain at 72 h. e Zeaxanthin content extracted from each strain at 72 h. Statistical analyses were performed using Student’s t-test, * p < 0.05. LL, low light; ML, moderate light; HL, high light