Effectiveness of the photochemical reflectance index to track photosynthetic activity over a range of forest tree species and plant water statuses
F. Ripullone A F , A. R. Rivelli A , R. Baraldi B , R. Guarini A , R. Guerrieri A , F. Magnani C , J. Peñuelas D , S. Raddi E and M. Borghetti A
+ Author Affiliations
- Author Affiliations
A Department of Crop Systems, Forestry and Environmental Sciences, University of Basilicata, viale dell’Ateneo Lucano 10, 85100 Potenza, Italy.
B Institute of Biometeorology, National Research Council (CNR), via Gobetti 101, 40129 Bologna, Italy.
C Department of Fruit and Trees, University of Bologna, via Fanin 46, 40127 Bologna, Italy.
D Global Ecology Unit, Center for Ecological Research and Forestry Applications (CREAF), Center for Ecological Research and Forestry Applications, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
E Department of Agricultural and Forest Economics, Engineering, Sciences and Technologies, University of Florence, Via S. Bonaventura, 13 50145 Firenze, Italy.
F Corresponding author. Email: francesco.ripullone@unibas.it
Functional Plant Biology 38(3) 177-186 https://doi.org/10.1071/FP10078
Submitted: 9 April 2010 Accepted: 27 January 2011 Published: 29 March 2011
Abstract
In this study, we investigated the potential of the photochemical resistance index (PRI) to track photosynthetic activity under water stress conditions by measuring PRI, leaf fluorescence, the xanthophyll cycle and photosynthetic activity in different forest tree species subjected to progressive drought. The PRI declined with pre-dawn water potential and a significant relationship between PRI and the xanthophyll de-epoxidation state (DEPS) was observed, although with large interspecific variability in the sensitivity of PRI to changes in DEPS. For single tree species, a strong relationship was observed on either PRI light saturated photosynthesis or PRI maximum photochemical efficiency of PSII (ΔF/Fm′); a larger variability in both relationships was apparent when data from different species were pooled together. However, an improved correlation was shown only in the former relationship by plotting the ΔPRI (dawn PRI minus the midday PRI values). Thus, we conclude that PRI is able to provide a good estimate of maximum CO2 assimilation at saturating light and ΔF/Fm′ for single tree species, despite the severe drought conditions applied. PRI should be applied more cautiously when dealing with multispecific forests because of confounding factors such as the strong interspecific differences in the initial value of PRI and in the sensitivity of PRI to changes in DEPS in response to drought.
Additional keywords: broadleaves, drought, evergreen, leaf reflectance, photosynthesis, xanthophylls.
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