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. 2017 Feb 21;8:185. doi: 10.3389/fpls.2017.00185

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Copyright © 2017 Long, Zhang, Yang, Ye, Lai, Tan, Lin and Chen.

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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Effects of pH on CO₂ assimilation (A), stomatal conductance (B), intercellular CO₂ concentration (C), transpiration rate (D), water-use efficiency (WUE, E), and Rubisco activity (F) in Citrus sinensis and Citrus grandis leaves. Bars represent means ± SE (n = 3 for Rubisco or n = 4 for the other parameters). Differences among the 10 treatments were analyzed by two (species) × five (pH) factorial ANOVA. Different letters above the bars indicate a significant difference at P < 0.05.