The relationship between non-photochemical quenching of chlorophyll fluorescence and the rate of photosystem 2 photochemistry in leaves

1990 ◽  
Vol 25 (3) ◽  
pp. 249-257 ◽  
Author(s):  
Bernard Genty ◽  
Jeremy Harbinson ◽  
Jean-Marie Briantais ◽  
Neil R. Baker
Keyword(s):  
Chlorophyll Fluorescence ◽  
Photosystem 2 ◽  
Photochemical Quenching ◽  
Non Photochemical Quenching ◽  
The Relationship

Analysis of the induction of chlorophyll fluorescence in leaves and isolated thylakoids: contributions of photochemical and non-photochemical quenching

1983 ◽  
Vol 220 (1219) ◽  
pp. 251-264 ◽  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Excitation Energy ◽  
Photosystem 2 ◽  
Fluorescence Yield ◽  
Photochemical Quenching ◽  
Induction Phase ◽  
Concentration Gradients ◽  
Photochemical Processes ◽  
Quenching Of Fluorescence ◽  
Non Photochemical Quenching

Quantitative analysis of the changes in the reduction-oxidation state of photosystem 2 electron acceptors and excitation energy distribution between photosystems 1 and 2 during the induction of chlorophyll fluorescence at 685 nm from a minimal to a maximal level in dark-adapted leaves and isolated thylakoids from Pisum sativum are presented. The data show that changes in the fluorescence yield during the induction phase are attributable not only to changes in the probability of trapped excitation energy being used for photosystem 2 photochemistry, as previously predicted, but also to large changes in the probability of energy loss through non-photochemical processes. A significant and variable amount of fluorescence quenching by non-photochemical processes in both leaves and thylakoids is demonstrated. The non-photochemical quenching of fluorescence during induction in isolated thylakoids was not modified by addition of a range of ionophores, which effectively destroyed delocalized electrical and cation concentration gradients across the membranes. Significant quenching of fluorescence by non-photochemical processes was also observed in both leaves and thylakoids treated with 3-(3, 4-dichlorophenyl)-1, 1-dimethylurea.

Using different solutions for radiative transfer of solar-induced fluorescence in a land surface model

2021 ◽  
Author(s):  
Tea Thum ◽  
Javier Pacheco-Labrador ◽  
Troy Magney ◽  
Mirco Migliavacca ◽  
Tristan Quaife ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Radiative Transfer ◽  
Land Surface ◽  
Land Surface Model ◽  
Global Scale ◽  
Photochemical Quenching ◽  
Surface Model ◽  
Simple Fraction ◽  
Non Photochemical Quenching ◽  
The Relationship

<p>Chlorophyll fluorescence (ChlF) takes place in green leaves of the plants during photosynthesis. It has therefore been proposed that ChlF can be used to track the photosynthetic activity of plants and the current possibility to observe sun-induced chlorophyll fluorescence (SIF) via remote sensing provides an unprecedented tool to monitor terrestrial photosynthesis at global scale. However, the relationship between photosynthesis and ChlF is not linear at all scales and is partly controlled by the non-photochemical quenching - which dissipates excess energy as heat. The relationship between the photochemical and fluorescence yields changes when the photochemical quenching is dominating at low irradiance conditions or at high stress conditions. Interpretation of observed SIF is complicated by its dependence on incoming absorbed radiation, observation geometry and radiative transfer of SIF photons within the canopy. To fully exploit remotely sensed SIF to estimate photosynthesis at ecosystem and global scales, it is important to account for these aspects through modelling that include ecosystem processes.</p><p>In this work we have implemented a ChlF model into a state-of-the-art land surface model QUantifying Interactions between terrestrial Nutrient CYcles and the climate system (QUINCY) simulating the terrestrial energy, water and biogeochemical cycles of carbon, nitrogen and phosphorus. The simulation of radiative transfer is highly influential for the simulated SIF signal, but the complex solutions of radiative transfer are computationally too heavy, making them impractical approaches at global scale. Therefore, we have investigated different radiative transfer techniques for the SIF signal of varying complexity at site scale in Niwot Ridge, U.S. <!-- we have now one clean growing season of data in a beech forests if you want to compare a deciduous and a evergreen, and of course a coule of years of grasslands (even if you don't want to put it in the abstract) -->The most complex solution is based on the mSCOPE and Fluspects model, that explicitly calculates signal transfer. The intermediate solution is based on a two-stream flux approach and the most simple is using a simple fraction for the escape ratio of SIF. Our aim is to assess which solution is most suitable for simulating the SIF signal at different scales and also test different formulations for modelling of non-photochemical quenching.</p>

scholarly journals On the relationship between non-photochemical quenching and photoprotection of Photosystem II

2012 ◽  
Vol 1817 (5) ◽  
pp. 760-769 ◽  
Author(s):  
Petar H. Lambrev ◽  
Yuliya Miloslavina ◽  
Peter Jahns ◽  
Alfred R. Holzwarth
Keyword(s):  
Photosystem Ii ◽  
Photochemical Quenching ◽  
Non Photochemical Quenching ◽  
The Relationship

scholarly journals Comparative research of photosynthetic processes in selected poikilohydric organisms from Mediterranean and Central-European alpine habitats

2018 ◽  
Vol 8 (2) ◽  
pp. 286-298
Author(s):  
Gabriella Nora Maria Giudici ◽  
Josef Hájek ◽  
Miloš Barták ◽  
Svatava Kubešová
Keyword(s):  
Czech Republic ◽  
Chlorophyll Fluorescence ◽  
Photochemical Quenching ◽  
Marchantia Polymorpha ◽  
Effective Quantum Yield ◽  
Response Curves ◽  
Chlorophyll Fluorescence Parameters ◽  
Fluorescence Parameters ◽  
Mediterranean Habitats ◽  
Non Photochemical Quenching

Dehydration-induced decrease in photosynthetic activity was investigated in five poikilohydric autotrophs using chlorophyll fluorescence parameters recorded during controlled desiccation. For the study, two representatives of mosses from alpine zone (Rhizomnium punctatum, Rhytidiadelphus squarrosus) of the Jeseníky Mts. (Czech Republic) were used. Other two experimental species were mediterranean habitats liverwort (Pellia endiviifolia) and moss (Palustriella commutata), collected from under Woodwardia radicans canopy in the Nature Reserve Valle delle Ferriere (Italy). The last species was a liverwort (Marchantia polymorpha) collected from lowland site (Brno, Moravia, Czech Republic). We investigated the relationship between relative water content (RWC) and several chlorophyll fluorescence parameters evaluating primary photochemical processes of photosynthesis, such as effective quantum yield of photosynthetic processes in photosystem II (ΦPSII), and non-photochemical quenching (qN). With desiccation from fully wet (RWC = 100%) to dry state (RWC = 0%), ΦPSII exhibited a rapid (R. punctatum) and slow decline of ΦPSII (R. squarrosus, P. endiviifolia, M. polymorpha, and P. commutata). Shapes of dehydration-response curves were species-specific. RWC0.5, i.e. the RWC at which the sample showed half of maximum ΦPSII, reflected the species-specificity. It reached 65% in desiccation sensitive (R. punctatum), 53% and 43% in semi-tolerant (P. commutata and R. squarrosus), 24% and 18% in desiccation-tolerant species (P. endiviifolia and M. polymorpha). In all experimental species, non-photochemical quenching (qN) of absorbed light energy showed high values at RWC = 100% and a slight increase with desiccation. Steady state chlorophyll fluorescence (FS) remained high during desiccation and was not correlated with ΦPSII.  

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