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. 2021 Mar 4;21:70. doi: 10.1186/s12866-021-02132-2

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 1 — Interaction effects of P. polymyxa SC2 on pepper seedlings. In pot experiments, a pepper seedling was irrigated with 5 mL P. polymyxa SC2 cells (1 × 10⁸ CFU/mL) and diluted with water to 200 mL. Control plant was irrigated with 5 mL sterilized LB medium diluted with water to 200 mL. At 30, 40, and 50 dpi, stem diameters (diameter at the ground base) were investigated. Panel (a) shows pepper stem diameters in healthy (H) soil and continuous cropping (C) soil. Values indicate means ± SD (n = 9; * P < 0.05, ** P < 0.01, Student’s t-test). Panel (b) is a representative image of the status of pepper in healthy soil at 40 dpi.