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. 2019 Aug 12;8(8):282. doi: 10.3390/plants8080282

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© 2019 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 (http://creativecommons.org/licenses/by/4.0/).

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Effects of heat stress on parameters measured by Dual-PAM in different varieties: C, control; T1, thermal effect in the first phase; T2, thermal effect in the second phase; R, recovery phase. (a) The relative values of the electron transport rate (the average value of the control plants of each genotype equals 1). (b) The ratio of the acceptor side limitation measured in high light (HL, ~2000 µmol m⁻² s⁻¹) and the value measured in low light (LL, ~40 µmol m⁻² s⁻¹). (c) Maximum quantum efficiency of PSII photochemistry. (d) The maximum amplitude of P700 kinetics. Average values ± SE are presented.