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. 2021 Aug 25;10(9):1772. doi: 10.3390/plants10091772

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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The intercellular CO₂ concentration (C_i) of the leaves of M. alba and B. papyrifera under different water stress levels. Note: Values are the means ± SE of 15 replicates. Different letters indicate significant differences at T0-T3 levels in each measurement. Bars with different letters are significantly different at p ≤ 0.05 (Tukey). AVG is the mean value of five measured data. M. alba-C_i: The intercellular CO₂ concentration of the leaves of M. alba. B. papyrifera-C_i: The intercellular CO₂ concentration of the leaves of B. papyrifera. T0 is the control group, T1 is the mild drought, T2 is the moderate drought, T3 is the severe drought.