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. 2014 Apr 28;14:111. doi: 10.1186/1471-2229-14-111

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Copyright © 2014 Song et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Changes in gas exchange at high temperatures. A: Pn represents photosynthetic rate; B: Gs represents stomatal conductance; C: Ci represents intercellular CO₂ concentration; D: Tr represents transpiration rate; E: iWUE represents intrinsic water use efficiency. 0h indicates the control group without high temperature treatment. 3-24h indicates different times of exposure to heat stress. Error bars represent standard error. Different letters on error bars indicate significant differences at P < 0.01. Symbols are the same in the following figures.