Detection of Water Stress in Orchard Trees with a High-Resolution Spectrometer through Chlorophyll Fluorescence in-filling of the O2-A band

A high spectral resolution spectrometer with 0.065-nm full-width half-maximum was used for collecting spectral measurements in an orchard field under three water stress treatments. The study was part of the FluorMOD project funded by the European Space Agency to develop a leaf-canopy reflectance model to simulate the effects of fluorescence. Water deficit protocols generated a gradient in solar-induced chlorophyll fluorescence emission and tree physiological measures. Diurnal steady-state chlorophyll fluorescence was measured from leaves in the field between June and November 2004 using the PAM-2100 fluorometer to study the effects of water stress on chlorophyll fluorescence. Spectral measurements of downwelling irradiance and upwelling crown radiance were conducted with the narrow-band spectrometer, enabling the canopy reflectance to be obtained at subnanometer spectral resolution and permitting the evaluation of the fluorescence in-filling effects on reflectance in trees under water stress conditions. Diurnal and seasonal measurements showed consistently lower steady-state fluorescence (Ft) and quantum yield F Fm in water-stressed trees, yielding mean values of Ft = 038 (well-irrigated) and Ft = 0 21 (water-stressed trees). The agreement between Ft and water potential showed that steady-state fluorescence could be used to detect differences in water stress levels, with determination coefficients ranging between 2 = 048 and 2 = 081 for individual dates. Analysis in the 680–770-nm range showed that the chlorophyll fluorescence in-filling in the O2-A band at 760 nm is sensitive to diurnal variations of fluorescence and water stress, yielding 2 = 0 76 (well-watered treatment), 2 = 0 89 (intermediate stress treatment), and 2 = 07 (extreme stress treatment), demonstrating the close relationships between Ft and in-filling at the crown level.This work was supported in part by the Consejo Superior de Investigaciones Científicas under the CSIC-PIF Program, in part by the European Space Agency (ESA), and in part by the Spanish Ministry of Science and Technology (MCyT) for the projects PIF-200440-F035, ESA-ESTEC Contract 16365/02/NL/FF (FluorMOD), and AGL2003-01468, respectively. The work of P. J. Zarco-Tejada was supported by the Ramón y Cajal (MCyT) and Averroes (JA) programs. The work of J. R. Miller was supported by the Natural Sciences and Engineering Research Council of Canada.Peer reviewe