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. 2022 Apr 5;11(7):995. doi: 10.3390/plants11070995

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© 2022 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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Pearson’s correlation and principal component analysis. (a) Measurement of morphological, structural and metabolic components using Pearson’s correlation. (b) Principal component analysis of samples from both White and White + FR groups. Asterisks: * p < 0.05, ** p < 0.01, *** p < 0.001. Measured extracts and growth variables include stem number, leaf number, internode, stem diameter (Φ), xylem thickness (Xthk), number of xylary fibres (Nxyl), number of vessels (Nves), xylary fibre/vessel ratio (X/V), thickness of cell wall (tcw), lignin concentration (Lignin), cellulose content (Cell), phenolic compounds (PhC) and reducing sugars (Sugar); (n = 10 ± SE). Open circle represents White and filled circle White + FR light treatment in tobacco plants.