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. 2018 Dec 21;9:3194. doi: 10.3389/fmicb.2018.03194

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Copyright © 2018 Xu, Yang, Liu, Wang, Wang, Qiu, Li, Chen and Yuan.

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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Effects of WSHM on the growth (A), AHL production (B), exopolysaccharide production (C), and exoY and expE gene expression (D) in S. meliloti 8530. All the data are expressed as average ± standard deviation (SD) (n = 3). Statistical significance was assessed by Student’s t-tests (^∗P < 0.05; ^∗∗P < 0.01; ^∗∗∗P < 0.001). For exopolysaccharides production (C), S. meliloti 1021 (ΔexpR) was also included. (A) YM-CN broth: the nitrogen (yeast extract) and carbon (mannitol) source in YM broth were removed.