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. 2017 Jan 10;7:2068. doi: 10.3389/fpls.2016.02068

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Copyright © 2017 Ma, Jiao, Fan, Sun, Zhang, Jiang and Liu.

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 P. fluorescens RG11 colonization on morphological differences between E+ and E- plantlets (A) and the endogenous melatonin levels in the roots of the four grape cultivars under salt stress conditions (B). E+, plants treated with the RG11; E-, plants not treated with the RG11. Each data point represents the mean of 12 plants for each treatment ± standard deviation. Data with asterisks indicate significant differences (^∗P < 0.05; ^∗∗P < 0.01; Student’s t-test). NS, not significant based on Student’s t-test.