Assessing photosynthetic efficiency in an experimental mangrove canopy using remote sensing and chlorophyll fluorescence

Nichol, Caroline; Rascher, Uwe; Matsubara, Shizue; Osmond, Barry

doi:10.1007/s00468-005-0005-7

Cited by 64 publications

(35 citation statements)

References 32 publications

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“…Some studies have demonstrated a strong correlation between PRI and NPQ (reviewed by Garbulsky et al [4]), but our measurements indicated a poorer performance of PRI in tracking NPQ over longer periods, which is similar to results of Nichol et al [7] and Rahimzadeh-Bajgiran et al [50]. Porcar-Castell et al [56] attributed disruptions in the relationship between PRI and NPQ to differences in the physiological mechanisms controlling each variable and to other forms of energy dissipation independent of the xanthophyll cycle, particularly at low temperatures.…”

Section: Use Of ∆Pri For Tracking Photosynthetic Performancesupporting

confidence: 90%

“…Regression analysis connecting data measured across all irradiation and temperature conditions (n = 45) showed the closest association of PRI with leaf Φ PSII (Figures 9 and 10), which concurs with results provided by other authors [7,39,49,50]. However, the tight relationship between Φ PSII , LUE, and PRI may exist only under non-stressed conditions [51], typically observed under low light intensities.…”

Section: Use Of Pri For Determining Photosynthetic Parameterssupporting

confidence: 89%

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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

et al. 2018

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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 (Φ PSII ). 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.

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Section: Use Of ∆Pri For Tracking Photosynthetic Performancesupporting

confidence: 90%

Section: Use Of Pri For Determining Photosynthetic Parameterssupporting

confidence: 89%

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

et al. 2018

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“…Diurnal changes in PRI were already shown to be related to diurnal adaptation of photosynthesis [53]. F 760 is emitted from the core of both photosystems and, thus, is related to the efficiency of photochemical energy separation.…”

Section: Discussionmentioning

confidence: 96%

“…The PRI, in contrast, is related to the degree of non-photochemical energy dissipation (NPQ). F 760 and PRI are often inversely correlated (e.g., [53,54]). However, it cannot be assumed that they are simply or linearly correlated.…”

Section: Discussionmentioning

confidence: 99%

Combining Sun-Induced Chlorophyll Fluorescence and Photochemical Reflectance Index Improves Diurnal Modeling of Gross Primary Productivity

et al. 2016

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Sun-induced chlorophyll fluorescence (F) is a novel remote sensing parameter providing an estimate of actual photosynthetic rates. A combination of this new observable and Monteith's light use efficiency (LUE) concept was suggested for an advanced modeling of gross primary productivity (GPP). In this demonstration study, we evaluate the potential of both F and the more commonly used photochemical reflectance index (PRI) to approximate the LUE term in Monteith's equation and eventually improve the forward modeling of GPP diurnals. Both F and the PRI were derived from ground and airborne based spectrometer measurements over two different crops. We demonstrate that approximating dynamic changes of LUE using F and PRI significantly improves the forward modeling of GPP diurnals. Especially in sugar beet, a changing photosynthetic efficiency during the day was traceable with F and incorporating F in the forward modeling significantly improved the estimation of GPP. Airborne data were projected to produce F and PRI maps for winter wheat and sugar beet fields over the course of one day. We detected a significant variability of both, F and the PRI within one field and particularly between fields. The variability of F and PRI was higher in sugar beet, which also showed a physiological down-regulation of leaf photosynthesis. Our results underline the potential of F to serve as a superior indicator for the actual efficiency of the photosynthetic machinery, which is linked to physiological responses of vegetation.

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“…In addition, the PRI is an index that was first formulated as an indicator of photosynthetic efficiency, but is also an indicator of photosynthesis rate through light use efficiency (Asner et al, 2005;Drolet et al, 2005;Fuentes et al, 2006;Guo & Trotter, 2004;Nakaji et al, 2006;Nichol et al, 2000Nichol et al, , 2002Serrano & Peñuelas, 2005;Sims et al, 2006;Strachan et al, 2002;Trotter et al, 2002) and through chlorophyll fluorescence (Dobrowsky et al, 2005;Evain et al, 2004;Nichol et al, 2006). Therefore, PRI in addition to being a water stress indicator, is also directly related to several physiological processes involved in the photosynthetic system.…”

Section: Introductionmentioning

confidence: 99%

Detecting water stress effects on fruit quality in orchards with time-series PRI airborne imagery

Suárez

Zarco‐Tejada

González-Dugo

et al. 2010

Remote Sensing of Environment

119

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A methodology for the assessment of fruit quality in crops subjected to different irrigation regimes is presented. High spatial resolution multispectral and thermal airborne imagery were used to monitor crown temperature and the Photochemical Reflectance Index (PRI) over three commercial orchards comprising peach, nectarine and orange fruit trees during 2008. Irrigation regimes included sustained and regulated deficit irrigation strategies, leading to high variability of fruit quality at harvest. Stem water potential was used to monitor individual tree water status on each study site. Leaf samples were collected for destructive sampling of xanthophyll pigments to assess the relationship between the xanthophyll epoxidation state (EPS) and PRI at leaf and airborne-canopy level. At harvest, fruit size, Total Soluble Solids (TSS) and Tritatable Acidity (TA) were measured to characterize fruit quality. A statistically significant relationship between EPS and PRI was found at the leaf (r 2 = 0.81) and canopy level (r 2 = 0.41). Airborne-derived crown PRI calculated from the imagery acquired during the fruit growth was related to the ratio of the total soluble solids normalized by the tritatable acidity (TSS/TA), an indicator of fruit quality measured on the same trees, yielding a coefficient of determination of r 2 = 0.50. The relationship between the integral of PRI time-series and TSS/TA yielded a coefficient of determination of r 2 =0.72(peach) and r 2 = 0.61 (nectarines). On the contrary, the relation between TSS/TA and the time-series of crown thermal imagery was very weak (r 2 = 0.21 and 0.25 respectively). These results suggest that a physiological remote sensing indicator related to photosynthesis, such as PRI, is more appropriate for fruit quality assessment than crown temperature, the established method of water stress detection, which is more related to crown transpiration. A radiative transfer modelling study was conducted to assess the potential validity of this methodology for fruit quality assessment when using medium spatial resolution imagery. The analysis shows important effects of soil and shadows on the PRI vs EPS relationship used for fruit quality assessment if non-pure crown reflectance was extracted from the imagery.

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Assessing photosynthetic efficiency in an experimental mangrove canopy using remote sensing and chlorophyll fluorescence

Cited by 64 publications

References 32 publications

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

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

Combining Sun-Induced Chlorophyll Fluorescence and Photochemical Reflectance Index Improves Diurnal Modeling of Gross Primary Productivity

Detecting water stress effects on fruit quality in orchards with time-series PRI airborne imagery

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