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. 2023 Jan 10;24(2):1346. doi: 10.3390/ijms24021346

Figure 3.

Figure 3

Effects of UV-B on the chlorophyll a fluorescence. The (A) actual (ΦPSII) and (B) maximum (Fv/Fm) efficiency of photosystem II (PSII) photochemistry were determined in control (bars in white) and UV-B treated (bars in black) microalgal strains (F4, LG1, PEC, and ETI). Measurements were performed at 18 h of treatment. UV-B exposure level was set at 1.7 W m−2 supplemented with 70 μmol m−2 s−1 photosynthetically active radiation (PAR). Control microalgal group only received PAR. Asterisks represent significant differences (* p < 0.05) between control and UV-B treatment within the same strain. Data are expressed as means of 6 different replicates ± standard deviation (SD). F4 and LG1: Chlorella sorokiniana strains; PEC: Pectinodesmus pectinatus strain; ETI: Ettlia pseudoalveolaris strain.