The major photoprotective role of anthocyanins in leaves of Arabidopsis thaliana under long-term high light treatment: antioxidant or light attenuator?

2020 ◽  
Author(s):  
Xiao-Ting Zheng ◽  
Zheng-Chao Yu ◽  
Jun-Wei Tang ◽  
Min-Ling Cai ◽  
Yi-Lin Chen ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Light Treatment ◽  
High Light ◽  
High Light Treatment

scholarly journals Indications for a Central Role of Hexokinase Activity in Natural Variation of Heat Acclimation in Arabidopsis thaliana

2020 ◽  
Author(s):  
Vasil Atanasov ◽  
Lisa Fürtauer ◽  
Thomas Nägele
Keyword(s):  
Arabidopsis Thaliana ◽  
Metabolic Regulation ◽  
Co2 Assimilation ◽  
High Light ◽  
Plant Performance ◽  
Hexokinase Activity ◽  
South Italy ◽  
Single Stress ◽  
Photosynthetic Capacities

Diurnal and seasonal changes of abiotic environmental factors shape plant performance and distribution. Changes of growth temperature and light intensity may vary significantly on a diurnal, but also on a weekly or seasonal scale. Hence, acclimation to a changing temperature and light regime is essential for plant survival and propagation. In the present study, we analyzed photosynthetic CO2 assimilation and metabolic regulation of the central carbohydrate metabolism in two natural accessions of Arabidopsis thaliana originating from Russia and south Italy during exposure to heat and a combination of heat and high light. Our findings indicate that it is hardly possible to predict photosynthetic capacities to fix CO2 under combined stress from single stress experiments. Further, capacities of hexose phosphorylation were found to be significantly lower in the Italian than in the Russian accession which could explain an inverted sucrose-to-hexose ratio. Together with the finding of significantly stronger accumulation of anthocyanins under heat/high light these observations indicate a central role of hexokinase activity in stabilization of photosynthetic capacities within a changing environment.

Wood Density and Above-Ground Growth in High and Low Wood Density Clones of Pinus radiata D. Don

1990 ◽  
Vol 17 (6) ◽  
pp. 615 ◽  
Author(s):  
DW Sheriff ◽  
DA Rook
Keyword(s):  
Wood Density ◽  
Pinus Radiata ◽  
Light Treatment ◽  
High Light ◽  
The Other ◽  
Stem Volume ◽  
Carbon Gain ◽  
Simple Relationship ◽  
Ground Biomass ◽  
High Light Treatment

In Pinus radiata a negative relationship has usually been found between stem volume and wood density. Clones previously found to produce wood of high or low density were used to investigate interrelationships between above-ground partitioning coefficients, carbon gain, and wood density. Cuttings had been propagated c. 5 years earlier, and were 5 m high when the experiment started. Potential carbon gain of the tree was manipulated by using two light environments; one with a light level c. 1.5 times the other. Measurements were of changes in stem, branch, and needle biomass during the 305-day experiment, of rates of photosynthesis, and of wood density by β-ray densitometry and microscopy; densities determined by the two techniques were the same. For all but two trees, wood densities of a stem and its branches were the same; for the other two, stem density was 13% less than that of their branches. Trees in the high light treatment accumulated more above-ground biomass, but there was no simple relationship between wood density and either above-ground growth or photosynthesis. With one exception, partitioning of photosynthate to stem was constant. In most cases, proportionately less photosynthate (30-80%) was allocated to below-ground biomass in the low light treatment than in the high light treatment (60-80%).

Physiological role of AOX1a in photosynthesis and maintenance of cellular redox homeostasis under high light in Arabidopsis thaliana

2014 ◽  
Vol 81 ◽  
pp. 44-53 ◽  
Author(s):  
Abhaypratap Vishwakarma ◽  
Leena Bashyam ◽  
Balasubramanian Senthilkumaran ◽  
Renate Scheibe ◽  
Kollipara Padmasree
Keyword(s):  
Arabidopsis Thaliana ◽  
Redox Homeostasis ◽  
Physiological Role ◽  
High Light ◽  
Cellular Redox

scholarly journals Melatonin Enhanced the Tolerance of Arabidopsis thaliana to High Light Through Improving Anti-oxidative System and Photosynthesis

2021 ◽  
Vol 12 ◽  
Author(s):  
Si-Jia Yang ◽  
Bo Huang ◽  
Yu-Qing Zhao ◽  
Di Hu ◽  
Tao Chen ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Light Stress ◽  
Photosynthetic Apparatus ◽  
High Light ◽  
Protective Effects ◽  
Biotic And Abiotic Stresses ◽  
Exogenous Melatonin ◽  
Sunlight Intensity ◽  
Oxidative System

Land plants live in a crisis-filled environment and the fluctuation of sunlight intensity often causes damage to photosynthetic apparatus. Phyto-melatonin is an effective bioactive molecule that helps plants to resist various biotic and abiotic stresses. In order to explore the role of melatonin under high light stress, we investigated the effects of melatonin on anti-oxidative system and photosynthesis of Arabidopsis thaliana under high light. Results showed that exogenous melatonin increased photosynthetic rate and protected photosynthetic proteins under high light. This was mainly owing to the fact that exogenous melatonin effectively decreased the accumulation of reactive oxygen species and protected integrity of membrane and photosynthetic pigments, and reduced cell death. Taken together, our study promoted more comprehensive understanding in the protective effects of exogenous melatonin under high light.

scholarly journals Vacuolar invertase activity shapes photosynthetic stress response of Arabidopsis thaliana and stabilizes central energy supply

2017 ◽  
Author(s):  
Jakob Weiszmann ◽  
Lisa Fürtauer ◽  
Wolfram Weckwerth ◽  
Thomas Nägele
Keyword(s):  
Arabidopsis Thaliana ◽  
Stress Response ◽  
Energy Metabolism ◽  
Plant Stress ◽  
Invertase Activity ◽  
High Light ◽  
Vacuolar Invertase ◽  
Central Energy ◽  
Sucrose Cleavage

AbstractStabilization of the central carbohydrate and energy metabolism plays a key role in plant stress response. As the primary photosynthetic products, carbohydrates are substrate for numerous metabolic and stress-protective reactions. Further, they have been shown to be involved in diverse signalling processes finally affecting and regulating plant stress response on a whole plant level. Sucrose metabolism is known to be central to many stress-related processes and enzymes catalysing its biosynthesis, transport and degradation have been shown to significantly impact stress resistance and acclimation output. However, due to the cyclic structure of sucrose metabolism involving sucrose cleavage in multiple compartments as well as energy-demanding re-synthesis via hexose phosphorylation, it is challenging to derive an unambiguous picture of its contribution to stress reactions. In the present study, a combined stress experiment comprising cold and high-light identified metabolism of sucrose and fumaric acid to significantly separate the stress response of a cold susceptible and a tolerant natural accession of Arabidopsis thaliana. Kinetic modelling and simulation of subcellular rates of invertase-driven sucrose cleavage revealed a contrasting picture between the susceptible and the tolerant accession pointing to an important role of vacuolar invertase during initial stress response. Using a T-DNA insertion mutant with a dramatically reduced invertase activity provided evidence for a central role of the enzyme in stabilizing photosynthesis and the central energy metabolism during freezing and high-light stress. Reducing vacuolar invertase activity to about 3% of the wild type resulted in a strong increase of ADP and ATP levels indicating a severe effect on cytosolic and plastidial energy balance. Together with a significant decrease of maximum quantum yield of photosystem II (Fv/Fm) these results suggest that vacuolar invertase activity stabilizes cytosolic energy metabolism by supplying hexose equivalents being phosphorylated in the cytosol. Finally, the accompanying ATP consumption is essential for cytosolic phosphate balance which directly affects photosynthetic performance by the supply of ADP being crucial for photosynthetic ATP production.

LHCII organization and thylakoid lipids affect the sensitivity of the photosynthetic apparatus to high-light treatment

2011 ◽  
Vol 49 (6) ◽  
pp. 629-635 ◽  
Author(s):  
Kolyo G. Dankov ◽  
Anelia G. Dobrikova ◽  
Bettina Ughy ◽  
Balázs Bogos ◽  
Zoltan Gombos ◽  
...  
Keyword(s):  
Photosynthetic Apparatus ◽  
Light Treatment ◽  
High Light ◽  
High Light Treatment ◽  
Thylakoid Lipids
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