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. 2019 Jun 28;19:284. doi: 10.1186/s12870-019-1890-z

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Primary root length elongation (mm) of seedlings of tobacco plants 7 days after inoculation with different E. purpurea (Ep) endophytes

TSB: tryptic soy broth (negative control), CF: culture filtrate. Bars indicate standard errors between two replicates (n = 15). a, c: seedlings belonging to the > 2 cm class; (b), (d): seedlings belonging to the < 2 cm class. *p_value < 0.05; and ** p_value < 0.01; *** p_value < 0.001.