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. 2017 Aug 11;18(8):1755. doi: 10.3390/ijms18081755

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© 2017 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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Effect of calcium on maximal photochemical efficiency of Photosystem II (Fv/Fm) (a) and performance index on absorption basis (PI_ABS) (b) in M. baccata leaves under temperature stress. TT, temperature treatment; CT, calcium treatment; NT, control. Lowercase letters above the bars indicate significant difference at p < 0.05 (Duncan’s test) of different treatments at the same temperature. Capital letters above the bars indicate significant difference at p < 0.05 (Duncan’s test) of the same treatment at different temperature.