Steady‐state chlorophyll fluorescence (Fs) measurements as a tool to follow variations of net CO<sub>2</sub> assimilation and stomatal conductance during water‐stress in C<sub>3</sub> plants

Flexas, Jaume; Escalona, José M.; Evain, S.; Gulías, Javier; Moya, I.; Osmond, C. B.; Medrano, H.

doi:10.1034/j.1399-3054.2002.1140209.x

Cited by 291 publications

(245 citation statements)

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“…F740 also further decreases, although slightly. A lowered fluorescence intensity due to water-stressed trees has been observed by previous work of different authors [26,27], and has been explained by closure of the stomata and an increased photorespiration in C3 plants [28]. An increasing oxidative stress as consequence of the decreased CO 2 availability induces NPQ mechanisms to rise again, quenching fluorescence.…”

Section: Discussionmentioning

confidence: 69%

Diurnal Cycle Relationships between Passive Fluorescence, PRI and NPQ of Vegetation in a Controlled Stress Experiment

et al. 2017

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Abstract:In order to estimate vegetation photosynthesis from remote sensing observations; some critical parameters need to be quantified. From all absorbed light; the plant needs to release any excess that is not used for photosynthesis; by non-photochemical quenching; by fluorescence emission and unregulated thermal dissipation. Non-photochemical quenching (NPQ) processes are controlled photoprotective mechanisms which; once activated; strongly control the dynamics of photochemical efficiency. With illumination conditions increasing and decreasing during a diurnal cycle; photoprotection mechanisms needs to change accordingly. The goal of this work is to quantify dynamic NPQ; measured from active fluorescence measurements; based on passive proximal sensing leaf measurements. During a 22-day controlled light and water stress experiment on a tobacco (Nicotiana tabacum L.) leaf we measured the diurnal dynamics of passive fluorescence (Chl F); the Photochemical Reflectance Index (PRI); the Absorbed Photosynthetically Active Radiation (APAR) and leaf temperature in combination with the actively retrieved non-photochemical quenching (NPQ) parameter. Based on a bi-linear combination of diurnal APAR and PRI (plane fit model) we succeeded to estimate NPQ with a RMSE of 0.08. The simple plane fit model estimation represents well the diurnal NPQ dynamics; except for the high light stress phase; when additional reversible photoinhibition processes took place. The present works presents a way of determining NPQ from passive remote sensing measurements; as a necessary step towards estimating photosynthetic rate.

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Section: Discussionmentioning

confidence: 69%

Diurnal Cycle Relationships between Passive Fluorescence, PRI and NPQ of Vegetation in a Controlled Stress Experiment

et al. 2017

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“…Empirical studies at the leaf and canopy scale indicate that the two light-use efficiency terms tend to covary under the conditions of the satellite measurement (35)(36)(37). Hence, the SIF data should provide information on both the light absorbed and the efficiency with which it is being used for photosynthesis.…”

Section: Resultsmentioning

confidence: 99%

Global and time-resolved monitoring of crop photosynthesis with chlorophyll fluorescence

Guanter

Zhang

Jung

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

859

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Photosynthesis is the process by which plants harvest sunlight to produce sugars from carbon dioxide and water. It is the primary source of energy for all life on Earth; hence it is important to understand how this process responds to climate change and human impact. However, model-based estimates of gross primary production (GPP, output from photosynthesis) are highly uncertain, in particular over heavily managed agricultural areas. Recent advances in spectroscopy enable the space-based monitoring of sun-induced chlorophyll fluorescence (SIF) from terrestrial plants.Here we demonstrate that spaceborne SIF retrievals provide a direct measure of the GPP of cropland and grassland ecosystems. Such a strong link with crop photosynthesis is not evident for traditional remotely sensed vegetation indices, nor for more complex carbon cycle models. We use SIF observations to provide a global perspective on agricultural productivity. Our SIF-based crop GPP estimates are 50-75% higher than results from state-ofthe-art carbon cycle models over, for example, the US Corn Belt and the Indo-Gangetic Plain, implying that current models severely underestimate the role of management. Our results indicate that SIF data can help us improve our global models for more accurate projections of agricultural productivity and climate impact on crop yields. Extension of our approach to other ecosystems, along with increased observational capabilities for SIF in the near future, holds the prospect of reducing uncertainties in the modeling of the current and future carbon cycle.crop productivity | carbon fluxes | Earth observation | carbon modeling | spaceborne spectroscopy T he rapidly growing demand for food and biofuels constitutes one of the greatest challenges for humanity in coming decades (1). It is estimated that we must double world food production by 2050 to meet increasing demand (2), but the once rapid growth seen in the "green revolution" has stalled, and even past advances are threatened by climate change (3-5). Much of past yield improvement has focused on increases in the harvest index and resistance to pests. However, all else being equal, the quantity of photosynthesis places an upper limit on the supply of food and fuels from our agricultural systems.Ironically, we currently have very limited ability to assess photosynthesis of the breadbaskets of the world. Agricultural production inventories provide important information about crop productivity and yields (6-8), but these are difficult to compare between regions and lag actual production. Carbon cycle models, based on either process-oriented biogeochemistry or semiempirical data-driven approaches, have been used to understand the controls and variations of global gross primary production (GPP, equivalent to ecosystem gross photosynthesis) (9) and to investigate the climate impact on crop yields (10). However, uncertainty associated with inaccurate input data and much simplified process descriptions based on the plant functional type concept severely challenge the applicat...

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“…Por otra parte, en Opuntia jaliscana la humedad baja fue la que más disminuyó la TTE. Se conoce que el estrés hídrico aumenta la competencia por el uso de los electrones, entre el proceso de fotorespiración y la asimilación de CO 2 (Flexas et al, 1999); estos resultados coinciden con los encontrados por Flexas et al (2002) en plantas C 3 en condiciones de campo.…”

Section: Tasa Relativa De Crecimiento (Trc) Se Esperaba Que Las Protunclassified

Factores abióticos involucrados en la facilitación entre leñosas y suculentas en el altiplano mexicano.

et al. 2013

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Resumen: Se estudiaron características fi siológicas y morfológicas de plántulas de especies leñosas (nodrizas) y suculentas (protegidas), las cuales se distribuyen en un gradiente ambiental en el Altiplano Mexicano. Del extremo mésico se eligieron Acacia schaffneri, A. farnesiana y Opuntia jaliscana y, del extremo xérico se escogieron A. schaffneri, Prosopis laevigata y O. streptacantha. En un experimento en invernadero, plántulas de 24 semanas de edad fueron sometidas por 90 días a diferentes niveles de radiación (alta = 2133 μmol m

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Steady‐state chlorophyll fluorescence (Fs) measurements as a tool to follow variations of net CO₂ assimilation and stomatal conductance during water‐stress in C₃ plants

Cited by 291 publications

References 43 publications

Diurnal Cycle Relationships between Passive Fluorescence, PRI and NPQ of Vegetation in a Controlled Stress Experiment

Diurnal Cycle Relationships between Passive Fluorescence, PRI and NPQ of Vegetation in a Controlled Stress Experiment

Global and time-resolved monitoring of crop photosynthesis with chlorophyll fluorescence

Factores abióticos involucrados en la facilitación entre leñosas y suculentas en el altiplano mexicano.

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Steady‐state chlorophyll fluorescence (Fs) measurements as a tool to follow variations of net CO2 assimilation and stomatal conductance during water‐stress in C3 plants

Cited by 291 publications

References 43 publications

Diurnal Cycle Relationships between Passive Fluorescence, PRI and NPQ of Vegetation in a Controlled Stress Experiment

Diurnal Cycle Relationships between Passive Fluorescence, PRI and NPQ of Vegetation in a Controlled Stress Experiment

Global and time-resolved monitoring of crop photosynthesis with chlorophyll fluorescence

Factores abióticos involucrados en la facilitación entre leñosas y suculentas en el altiplano mexicano.

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Steady‐state chlorophyll fluorescence (Fs) measurements as a tool to follow variations of net CO₂ assimilation and stomatal conductance during water‐stress in C₃ plants