scholarly journals The Enhancement of Photosynthesis by Fluctuating Light

10.5772/31040 ◽  
2012 ◽  
Author(s):  
David Iluz ◽  
Irit Alexandrovich ◽  
Zvy Dubinsky
Keyword(s):  
Fluctuating Light

scholarly journals Sunfleck properties from time series of fluctuating light

2021 ◽  
Vol 308-309 ◽  
pp. 108554
Author(s):  
Maxime Durand ◽  
Baiba Matule ◽  
Alexandra J. Burgess ◽  
T. Matthew Robson
Keyword(s):  
Time Series ◽  
Fluctuating Light

Modelling photosynthesis in fluctuating light with inclusion of stomatal conductance, biochemical activation and pools of key photosynthetic intermediates

Planta ◽  
1997 ◽  
Vol 204 (1) ◽  
pp. 16-26 ◽  
Author(s):  
M. U. F. Kirschbaum ◽  
M. Küppers ◽  
H. Schneider ◽  
C. Giersch ◽  
S. Noe
Keyword(s):  
Stomatal Conductance ◽  
Fluctuating Light ◽  
Biochemical Activation

scholarly journals A chloroplast thylakoid lumen protein is required for proper photosynthetic acclimation of plants under fluctuating light environments

2017 ◽  
Vol 114 (38) ◽  
pp. E8110-E8117 ◽  
Author(s):  
Jun Liu ◽  
Robert L. Last
Keyword(s):  
Photosystem Ii ◽  
Light Stress ◽  
High Irradiance ◽  
Light Conditions ◽  
Agricultural Plant ◽  
Photosynthetic Organisms ◽  
Fluctuating Light ◽  
Stress Susceptibility ◽  
Efficiency And Productivity ◽  
Photosynthetic Adaptation

Despite our increasingly sophisticated understanding of mechanisms ensuring efficient photosynthesis under laboratory-controlled light conditions, less is known about the regulation of photosynthesis under fluctuating light. This is important because—in nature—photosynthetic organisms experience rapid and extreme changes in sunlight, potentially causing deleterious effects on photosynthetic efficiency and productivity. Here we report that the chloroplast thylakoid lumenal protein MAINTENANCE OF PHOTOSYSTEM II UNDER HIGH LIGHT 2 (MPH2; encoded byAt4g02530) is required for growth acclimation ofArabidopsis thalianaplants under controlled photoinhibitory light and fluctuating light environments. Evidence is presented thatmph2mutant light stress susceptibility results from a defect in photosystem II (PSII) repair, and our results are consistent with the hypothesis that MPH2 is involved in disassembling monomeric complexes during regeneration of dimeric functional PSII supercomplexes. Moreover,mph2—and previously characterized PSII repair-defective mutants—exhibited reduced growth under fluctuating light conditions, while PSII photoprotection-impaired mutants did not. These findings suggest that repair is not only required for PSII maintenance under static high-irradiance light conditions but is also a regulatory mechanism facilitating photosynthetic adaptation under fluctuating light environments. This work has implications for improvement of agricultural plant productivity through engineering PSII repair.

scholarly journals Resolving diurnal dynamics of the chloroplastic glutathione redox state in Arabidopsis reveals its photosynthetically-derived oxidation

2021 ◽  
Author(s):  
Zechariah Haber ◽  
Nardy Lampl ◽  
Andreas J Meyer ◽  
Einat Zelinger ◽  
Matanel Hipsch ◽  
...  
Keyword(s):  
Redox State ◽  
Fluorescent Protein ◽  
Operating Efficiency ◽  
High Temporal Resolution ◽  
Fluctuating Light ◽  
Gsh Metabolism ◽  
Glutathione Cycle ◽  
Green Fluorescent ◽  
Glutathione Redox

Abstract Plants are subjected to fluctuations in light intensity, and this causes unbalanced photosynthetic electron fluxes and overproduction of reactive oxygen species (ROS). Electrons needed for ROS detoxification are drawn, at least partially, from the cellular glutathione (GSH) pool via the ascorbate-glutathione cycle. Here, we explore the dynamics of the chloroplastic glutathione redox potential (chl-EGSH) using high-temporal-resolution monitoring of Arabidopsis (Arabidopsis thaliana) lines expressing the reduction-oxidation sensitive green fluorescent protein 2 (roGFP2in chloroplasts. This was carried out over several days, under dynamic environmental conditions and in correlation with PSII operating efficiency. Peaks in chl-EGSH oxidation during dark-to-light and light-to-dark transitions were observed. Increasing light intensities triggered a binary oxidation response, with a threshold around the light saturating point, suggesting two regulated oxidative states of the chl-EGSH. These patterns were not affected in npq1 plants, which are impaired in nonphotochemical quenching. Oscillations between the two oxidation states were observed under fluctuating light in WT and npq1 plants, but not in pgr5 plants, suggesting a role for PSI photoinhibition in regulating the chl-EGSH dynamics. Remarkably, pgr5 plants showed an increase in chl-EGSH oxidation during the nights following light stresses, linking daytime photoinhibition and nighttime GSH metabolism. This work provides a systematic view of the dynamics of the in vivo chloroplastic glutathione redox state during varying light conditions.

scholarly journals Acclimatory responses of Arabidopsis to fluctuating light environment: comparison of different sunfleck regimes and accessions

2012 ◽  
Vol 113 (1-3) ◽  
pp. 221-237 ◽  
Author(s):  
Philipp Alter ◽  
Anne Dreissen ◽  
Fang-Li Luo ◽  
Shizue Matsubara
Keyword(s):  
Light Environment ◽  
Fluctuating Light

scholarly journals Exploiting heterogeneous environments: does photosynthetic acclimation optimize carbon gain in fluctuating light?

2015 ◽  
Vol 66 (9) ◽  
pp. 2437-2447 ◽  
Author(s):  
Renata Retkute ◽  
Stephanie E. Smith-Unna ◽  
Robert W. Smith ◽  
Alexandra J. Burgess ◽  
Oliver E. Jensen ◽  
...  
Keyword(s):  
Photosynthetic Acclimation ◽  
Carbon Gain ◽  
Heterogeneous Environments ◽  
Fluctuating Light
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