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Potential of Photochemical Reflectance Index for Indicating Photochemistry and Light Use Efficiency in Leaves of European Beech and Norway Spruce Trees

1
Global Change Research Institute CAS, Bělidla 986/4a, 603 00 Brno, Czech Republic
2
CSIC, Global Ecology Unit CREAF-CSIC-UAB, E-08193 Bellaterra (Catalonia), Spain
3
CREAF, E-08193 Cerdanyola del Vallès (Catalonia), Spain
*
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(8), 1202; https://doi.org/10.3390/rs10081202
Received: 1 May 2018 / Revised: 19 July 2018 / Accepted: 24 July 2018 / Published: 31 July 2018
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Abstract

Hyperspectral reflectance is becoming more frequently used for measuring the functions and productivity of ecosystems. The purpose of this study was to re-evaluate the potential of the photochemical reflectance index (PRI) for evaluating physiological status of plants. This is needed because the reasons for variation in PRI and its relationships to physiological traits remain poorly understood. We examined the relationships between PRI and photosynthetic parameters in evergreen Norway spruce and deciduous European beech grown in controlled conditions during several consecutive periods of 10–12 days between which the irradiance and air temperature were changed stepwise. These regime changes induced significant changes in foliar biochemistry and physiology. The responses of PRI corresponded particularly to alterations in the actual quantum yield of photosystem II photochemistry (ΦPSII). Acclimation responses of both species led to loss of PRI sensitivity to light use efficiency (LUE). The procedure of measuring PRI at multiple irradiance-temperature conditions has been designed also for testing accuracy of ΔPRI in estimating LUE. A correction mechanism of subtracting daily measured PRI from early morning PRI has been performed to account for differences in photosynthetic pigments between irradiance-temperature regimes. Introducing ΔPRI, which provided a better estimate of non-photochemical quenching (NPQ) compared to PRI, also improved the accuracy of LUE estimation. Furthermore, ΔPRI was able to detect the effect of drought, which is poorly observable from PRI. View Full-Text
Keywords: photochemical reflectance index; chlorophyll fluorescence; CO2 assimilation; light use efficiency; temperature; drought photochemical reflectance index; chlorophyll fluorescence; CO2 assimilation; light use efficiency; temperature; drought
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Kováč, D.; Veselovská, P.; Klem, K.; Večeřová, K.; Ač, A.; Peñuelas, J.; Urban, O. Potential of Photochemical Reflectance Index for Indicating Photochemistry and Light Use Efficiency in Leaves of European Beech and Norway Spruce Trees. Remote Sens. 2018, 10, 1202.

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