Figure 2.

Changes in the non-photochemical fluorescence quenching (NPQ): (A) photochemical quenching in the relative reduction state of QA reflecting the fraction of open PSII reaction centres (qP) (B) and vitality index of PSII indicative of interactions between the light-stage reactions activated by PAR absorption and the dark reactions of photosynthesis (Rfd) (C) in green and red kale microgreens cultivated under different spectral compositions of light. Columns with different letters are statistically different for different lights and types of kale (p < 0.05). Mean values from two cycles represent the average of six plants per replication (experimental unit) and four replications per treatment in each cycle.