Figure 2.

Carotenoid composition of C. reinhardtii strains. Cells were grown at an incident photon flux density (PFD) of 70 μmol photons m⁻²⋅s⁻¹ (low light, LL) and then dark-adapted overnight. Carotenes (A), α-carotene-derived xanthophylls (B), and β-carotene-derived xanthophylls (C) were determined by HPLC analysis of cell extracts before (LL, dark-adapted) and after exposure to 1,160 μmol photons m⁻²⋅s⁻¹ for 15 min [LL + high light (HL)] by using the same conditions as for measurements of fluorescence. Values are the means of two independent experiments. Loro, loroxanthin; Alpha-Car, α-carotene; Zea, zeaxanthin; Anthera, antheraxanthin; Viola, violaxanthin; Neo, neoxanthin; Beta-Car, β-carotene.