Potential of Photochemical reflectance index for indicating photochemistry and light use efficiency in leaves of European beech and Norway spruce trees
Kováč, Daniel (Global Change Research Institute CAS)
Veselovská, Petra (Global Change Research Institute CAS)
Klem, Karel (Global Change Research Institute CAS)
Večeřová, Kristýna (Global Change Research Institute CAS)
Ač, Alexander (Global Change Research Institute CAS)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Urban, Otmar (Global Change Research Institute CAS)

Data:	2018
Resum:	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 ∆PRI 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 ∆PRI, which provided a better estimate of non-photochemical quenching (NPQ) compared to PRI, also improved the accuracy of LUE estimation. Furthermore, ∆PRI was able to detect the effect of drought, which is poorly observable from PRI.
Ajuts:	Ministerio de Economía y Competitividad CGL2016-79835-P European Commission 610028 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-274
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Photochemical reflectance index ; Chlorophyll fluorescence ; CO2 assimilation ; Light use efficiency ; Temperature ; Drought
Publicat a:	Remote sensing (Basel), Vol. 10, Núm. 8 (July 2018) , art. 1202, ISSN 2072-4292

DOI: 10.3390/rs10081202

27 p, 2.9 MB

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