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. 2023 Oct 22;12(20):3647. doi: 10.3390/plants12203647

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Correlation matrix among different phytohormone groups and endogenous GABA detected in Valencia sweet orange (C. sinensis) leaves without GABA treatment (Control) or after the treatment with 10 mM GABA (treated). (A) healthy leaves and (B) Ca. L. asiaticus’-infected leaves. Correlation coefficients (r) based on Pearson product-moment correlation are indicated by the color intensity and circle size. The color scale, in the middle of the graph, illustrates the correlation coefficients and their corresponding colors. BA: benzoic acid, tCA: trans-cinnamic acid, SA: salicylic acid, tJA: trans-jasmonic acid, IAA: indole-3-acetic acid, IPA: indole-3-propionic acid, IBA: indole-3-butyric acid, ABA: abscisic acid, and GABA: γ-aminobutyric acid.