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. 2019 Dec 6;10:1563. doi: 10.3389/fpls.2019.01563

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Copyright © 2019 Chen, Li, Yang, Zhang, Zou, Bian and Wen

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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(A) Net leaf photosynthetic rate (P_n) and (B) stomatal conductance (g_s) of lettuce leaves in response to low (250 µmol m⁻² s⁻¹) and high (1500 μmol m⁻² s⁻¹) photosynthetic photon flux density (PPFD). Error bars show ± SE (n = 5).