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. 2016 Mar 30;7:270. doi: 10.3389/fpls.2016.00270

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Copyright © 2016 Wang, Tong, Yang and Xin.

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) or licensor 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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Time course of air temperature (A), vapor pressure deficit (VPD) (B) and CO₂ concentration (C). ___: environmental conditions in the PPAL_e; ……: environmental conditions in the PPAL_c; - - -: outdoor environmental conditions.