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. 2026 Aug 4;17:1896630. doi: 10.3389/fmicb.2026.1896630

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Copyright © 2026 Ding, Liu, Zhang, Yang, Jiang and Jiang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Panel A presents a heatmap showing strong correlation coefficients between four QC samples, with values ranging from 0.943 to 1. Panel B shows a PCA biplot differentiating five groups by colored ellipses, indicating separation between group clusters along PC1 and PC2 axes. Panel C features a bar graph comparing the percentage of up-regulated class I metabolites in leaves and roots across metabolite types, with lipids, terpenoids, and others showing the highest percentages in both tissues. — Quality control and the proportion of up-regulated metabolites in citrus. (A) Quality Control (QC) correlation heatmap. (B) Principal component analysis (PCA). (C) The proportion of up-regulated metabolites in leaves and roots.