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. 2021 Sep 14;44(11):3552–3570. doi: 10.1111/pce.14177

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© 2021 The Authors. Plant, Cell & Environment published by John Wiley & Sons Ltd.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Relationship between drone‐based tree‐level photochemical reflectance index (PRI) and leaf‐level (a–d) de‐epoxidation state of the xanthophyll cycle (DEPS), (e–h) carotenoid to chlorophyll pool ratio and (i–l) violaxanthin (V) + antheraxanthin (A) + zeaxanthin (Z) to chlorophyll pool ratio, for all dates, for spring (only 2019) and for summer and autumn dates in 2019 and 2020 at the Pfynwald Pinus sylvestris experimental forest site. Symbols represent mean values for trees surrounding scaffolds (n ≥ 3) in each (sub)plot and error bars are SD. Precipitation manipulation (irrigation) treatments are represented with different shades of gray: dark for control (C), light for irrigation‐stop (IS) and white for irrigated (I). Seasons are represented with different symbols. r² values and significance levels are indicated for the linear correlations (dashed regression lines are given for significant relationships; *p < .05, **p < .01, ***p < .001)