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. 2019 Dec 31;9:20416. doi: 10.1038/s41598-019-56882-1

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© The Author(s) 2019

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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M. aeruginosa cells are sensitive to oxidative stress. (a) The listed cyanobacterial antioxidant genes are SOD, superoxide dismutase; Kat, catalase; Prx, peroxidase; and Gpx, glutathione peroxidase. M. aeruginosa does not have a gene for producing a catalase. (b) Axenic of M. aeruginosa PCC7806 and M. aeruginosa PCC7806 with Rhizobium sp. MK23 were treated with 500 µM concentration of H₂O_2. After 7 days of treatment, the growth of M. aeruginosa PCC7806 was retarded under H₂O₂. (c) The growth of axenic M. aeruginosa PCC7806 with Rhizobium sp. MK23 did not change significantly. (d) The axenic PCC7806 treated with H₂O₂ was transparent in color and had an unusual cell shape. (e) PCC7806 co-cultured with Rhizobium sp. MK23 were still green and had a normal, round shape. (f) The standard curve for H₂0₂ concentrations in H₂O₂ assay. (g) In the H₂O₂ assay, the concentrations of H₂O₂ were much higher in the light condition than in dark.