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. 2022 Jan 21;12:809828. doi: 10.3389/fpls.2021.809828

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Copyright © 2022 Liu, Li, Tomasetto, Yan, Tan, Liu 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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Original and various pretreatment spectra of T. sinensis seedling leaves collected under distinct water gradients. (A) Original spectra, (B) SNV: SNV spectra, (C) FSG: the first derivative combined with S-G smoothing spectra, (D) SSG: the second derivative combined with S-G smoothing spectra, (E) SNV_FSG: SNV combined with the first derivative and S-G smoothing spectra, (F) SNV_SSG: SNV combined with the second derivative and S-G smoothing spectra.