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Forests 2017, 8(10), 386; https://doi.org/10.3390/f8100386

Assessment of the Response of Photosynthetic Activity of Mediterranean Evergreen Oaks to Enhanced Drought Stress and Recovery by Using PRI and R690/R630

1
CSIC, Global Ecology Unit, CREAF-CSIC-UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain
2
CREAF, Cerdanyola del Vallès, 08193 Barcelona, Catalonia, Spain
*
Author to whom correspondence should be addressed.
Received: 31 July 2017 / Revised: 16 September 2017 / Accepted: 7 October 2017 / Published: 10 October 2017
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Abstract

The photochemical reflectance index (PRI) and red-edge region of the spectrum are known to be sensitive to plant physiological processes, and through measurement of these optical signals it is possible to use non-invasive remote sensing to monitor the plant photosynthetic status in response to environmental stresses such as drought. We conducted a greenhouse experiment using Quercus ilex, a Mediterranean evergreen oak species, to investigate the links between leaf-level PRI and the red-edge based reflectance ratio (R690/R630) with CO2 assimilation rates (A), and photochemical efficiency (FV/FM and Yield) in response to a gradient of mild to extreme drought treatments (nine progressively enhanced drought levels) and corresponding recovery. PRI and R690/R630 both decreased under enhanced drought stress, and had significant correlations with A, FV/FM and Yield. The differential values between recovery and drought treatments of PRI (ΔPRIrecovery) and R690/R630 (ΔR690/R630recovery) increased with the enhanced drought levels, and significantly correlated with the increases of ΔArecovery, ΔFV/FMrecovery and ΔYieldrecovery. We concluded that both PRI and R690/R630 were not only sensitive to enhanced drought stresses, but also highly sensitive to photosynthetic recovery. Our study makes important progress for remotely monitoring the effect of drought and recovery on photosynthetic regulation using the simple physiological indices of PRI and R690/R630. View Full-Text
Keywords: chlorophyll fluorescence (ChlF); drought; Mediterranean; photochemical reflectance index (PRI); photosynthesis; R690/R630; recovery chlorophyll fluorescence (ChlF); drought; Mediterranean; photochemical reflectance index (PRI); photosynthesis; R690/R630; recovery
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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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Zhang, C.; Preece, C.; Filella, I.; Farré-Armengol, G.; Peñuelas, J. Assessment of the Response of Photosynthetic Activity of Mediterranean Evergreen Oaks to Enhanced Drought Stress and Recovery by Using PRI and R690/R630. Forests 2017, 8, 386.

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