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. 2021 Mar 30;11:7210. doi: 10.1038/s41598-021-86732-y

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© The Author(s) 2021

Open Access This 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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The total chlorophylls, total carotenoids, VAZ (xanthophyll cycle pigments) and AZ/VAZ (deepoxidation state of xanthophyll cycle pool) in leaves of ‘Grace Star’ and ‘Schneiders’, sampled at time 0, time 24, time 48 and time 72 in Experiment I. The overnight chilling treatment (CT) comprises four patterns: CT1 (one exposure, black filled circle); CT2 (two exposures, black filled triangle); CT3 (three exposures, black filled square) and C (control trees, white filled diamond). A black filled rectangle indicates the night-time exposure to CT, while white filled rectangle indicates the night under natural conditions. Vertical bars represent ± SE of the mean (n = 3; n = 3 and 6 for controls).