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. 2020 Jan 24;10:1748. doi: 10.3389/fpls.2019.01748

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Copyright © 2020 Zhuang, Wang, Zhang, Chen, Wang, Liu, Zhou and Chai

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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Quantitative analyses of osmotic adjustment substances in 3-month-old WT, PdC3H17OE (17OE), and PdC3H17ΔCOE (17ΔCOE) poplars after well-watered or drought stress conditions for 20 days. (A) Free proline. (B) Soluble protein. (C) Soluble sugar. At least six plants of two lines in each genotype were measured. Data are presented as mean ± SD. Different letters above bars denote statistical significance between treatments of leaves (P < 0.05). P < 0.05.