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. 2019 Feb 5;10:39. doi: 10.3389/fpls.2019.00039

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Copyright © 2019 Deng, Hou, Liu, Li, Bartish, Tian, Chen, Du, Jiang and Shi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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CO₂-response curves of five Gnetum species. Y-axes represent five photosynthetic characters (mean values ± standard deviation, n = 3), i.e., (A) photosynthetic rate (Pn), (B) stomatal conductance (Gs), (C) intercellular CO₂ concentration (Ci), (D) transpiration rate (Tr), and (E) water use efficiency (WUE). X-axis represents CO₂ concentration.