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. 2018 Feb 28;23(3):535. doi: 10.3390/molecules23030535

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© 2018 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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Photosynthetic pigments concentration (chlorophyll a, b and carotenoids) (A) and chlorophyll fluorescence-related parameters (B–D) in leaves of tomato plants grown under control or stress combination conditions (salinity + heat, S + H) with (+Mel) or without melatonin pre-treatment; (B) Maximum photochemical yield of PSII; (C) PSII Efficiency; (D) Electron transport rate. The figure is representative of four different measurements during the experiment. Values represent means ± SE (n = 6). Bars with different letters within each panel are significantly different at p > 0.05 according to Tukey’s test.