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

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Effects of UV-B on the photosynthetic pigments. (A) Chlorophyll a (Chla), (B) chlorophyll b (Chlb), and (C) carotenoids (Car) concentrations were determined in control (bars in white) and UV-B treated (bars in black) microalgal strains (F4, LG1, PEC, and ETI). UV-B exposure level was set at 1.7 W m⁻² supplemented with 70 μmol m⁻² s⁻¹ photosynthetically active radiation (PAR) following a time course from 0 to 18 h. Control microalgal group only received PAR. Asterisks represent significant differences (* p < 0.05) between control and UV-B treatment within the same strain at a specific time point. Data are expressed as means of 3 different replicates ± standard deviation (SD). F4 and LG1: Chlorella sorokiniana strains; PEC: Pectinodesmus pectinatus strain; ETI: Ettlia pseudoalveolaris strain.