Figure 2.

Diadinoxanthin (Ddx) and diatoxanthin (Dtx) dynamics of Phaeodactylum cultures during an non‐photochemical quenching (NPQ) induction experiment.

Cells were exposed to 15 min of high light (2000 μmol photons m⁻² sec⁻¹, white bar) and 30 min of low light (75 μmol photons m⁻² sec⁻¹, black bar). Concentrations of Ddx (a) and Dtx (b) were measured via HPLC analyses and normalized to total chlorophyll a. Dynamics were observed for Phaeodactylum WT, two zep3 mutant strains, and one ZEP3 complemented strain. Points are averages with error bars representing one standard deviation of biological replicates (n = 3). Error bars may be smaller than symbols in some cases.