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. 2017 Jul 11;8:1208. doi: 10.3389/fpls.2017.01208

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Copyright © 2017 Song, Xu, Sun, Jiang, Tian, Yong, Yang, Cai and Cui.

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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Partial least squares-discriminate analysis (PLS-DA) score plots of metabolic profiles in alfalfa roots under the alkali stress. (A) PLS-DA score plot for NI control (black), NI alkali-treated (blue) samples, (B) PLS-DA score plot for RI control (red) and RI alkali-treated (yellow) samples, (C) PLS-DA score plot for NI control (black) and RI control (red) samples, (D) PLS-DA score plot for NI alkali-treated (blue) and RI alkali-treated (yellow) samples.