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. 2022 Aug 11;15:81. doi: 10.1186/s13068-022-02181-3

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© The Author(s) 2022

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. 4 — Classification and analysis of differential metabolites in P. polymyxa SC2-M1. Cluster analysis of differential metabolites in the positive (A) and negative (B) ion mode. Each row represents a differential metabolite and each column represents a sample. The color represents the expression level of differential metabolites, and the green to red corresponds to the expression level from low to high. Bubble chart of metabolic pathway enrichment analysis in the positive (C) and negative (D) ion mode. Red represents the significant enrichment and the size of the dot represents the number of different metabolites annotated in the pathway