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. 2021 Dec 28;79(1):34. doi: 10.1007/s00284-021-02748-7

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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/.

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Fig. 1 — Principal component analysis of metabolic profiles in P. australis endosphere and rhizosphere under different AMD pollution gradient. a Score plot of PC2 versus PC1. Black ellipses represent the 90% confidence intervals for each group. b Loading plot of PC2 versus PC1 showing metabolites with significant loadings at P < 0.1. c Supervised hierarchical clustering heatmap of significant metabolites identified by PC loadings. The color scheme red and green indicate high and low concentrations of metabolites, respectively (Color figure online)