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. 2023 Feb 20;14:1087070. doi: 10.3389/fpls.2023.1087070

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Copyright © 2023 Kim, Dubey, Hwangbo, Chung, Lee and Lee

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Changes in photosynthetic activity, chlorophyll, and protein contents of C. reinhardtii cells after repetitive X-irradiation with 6 Gy. (A–D) The chlorophyll fluorescence and quenching parameters Fv/Fm, qP, NPQ, and the maximal electron transport rate ETRmax were obtained and used to evaluate the photosynthetic activity of C. reinhardtii cells as described in the Materials and Methods section. (E, F) The chlorophyll and protein contents (μg) of C. reinhardtii cells (10⁸). Data represent the mean ± standard error (SE) with n = 9 from three independent experiments. Asterisks indicate significant differences between mock (white bars) and irradiated samples (gray bars) based on a two-sample independent t-test (p < 0.05).