Figure 5.

Effects of different light colors on the photosynthetic vitality after addition of H₂O₂. The graphs show the decrease in photosynthetic vitality of Microcystis PCC 7806 in blue (450 nm), green (530 nm), orange (630 nm) and far red light (730 nm) after H₂O₂ addition of (A,B) 2 mg/L and (C,D) 5 mg/L. For each light color, Microcystis was exposed to a light intensity of (A,C) 5 µmol photons·m⁻²·s⁻¹ and (B,D) 50 µmol photons·m⁻²·s⁻¹. Photosynthetic vitality is defined as the photosynthetic yield of cells treated with H₂O₂ as a percentage of the control samples of cells not exposed to H₂O₂. Symbols represent the average ± standard deviation (SD) of four biological replicates. Dashed black lines represent the control without H₂O₂.