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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/).
Differences in the CFI curves between the adaxial and abaxial sides of sunflower leaves grown under full sunlight (A–C) and low light (D–F). The pulsed light intensities were 200 (A,D), 1000 (B,E), and 3000 (C,F) µmol·m−2·s−1.