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. 2022 Nov 18;12(11):1922. doi: 10.3390/life12111922

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© 2022 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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Chlorophyll fluorescence parameters in tomato plants after 10 days of drought stress. Fluorescence images of maximum PSII yield (Fv/Fm) (A), maximum PSII yield (Fv/Fm) values (B), electron transport rate (ETR) (C), and non-photochemical quenching (NPQ) (D). Scale bars represent 100 µm in the fluorescence images of maximum PSII yield. The values presented above are the average of six replicates ± S.D. (n = 6). Significant differences among different treatments in the experiment were determined by LSD 0.05 test and are indicated by different letters.