Physiology of Light Tolerance in Plants

Adams, William W.; Grace, Stephen C.

doi:10.1002/9780470650608.ch4

Cited by 12 publications

(5 citation statements)

References 65 publications

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“…The actual quantum yield of PS 2 electron transport, Φ PS2 = (F' m -F s )/F' m . The coefficients of photochemical (qP) and non-photochemical (NPQ) quenching were calculated, as qP = (F' m -F s )/(F' m -F' 0 ) (Schindler and Lichtenthaler 1996) and NPQ = (F m -F' m )/F' m (Demmig-Adams et al 1997). The apparent electron transport rate (ETR) was calculated as: ETR (Jt) = Φ PS2 × PPFD × 0.84 × 0.5, where PPFD was 400 μmol m -2 s -1 , 0.84 was the coefficient of absorption of the leaves, and 0.5 was assumed as the fraction of the excitation energy distributed to PS 2.…”

Section: Methodsmentioning

confidence: 99%

Influence of water stress on photosynthetic characteristics in barley plants under ambient and elevated CO<sub>2</sub> concentrations

Robredo¹,

Pérez‐López²,

Lacuesta³

et al. 2010

Biol. plant.

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We evaluated the combined effects of elevated CO 2 and water availability on photosynthesis in barley. Soil and plant water content decreased with water stress, but less under elevated CO 2 concentration (EC) compared with ambient CO 2 concentration (AC). During water stress, stomatal conductance, carboxylation rate, RuBP regeneration, and the rate of triose phosphate utilisation (TPU) were decreased but less when plants grew under EC. Drought treatments caused only a slight effect on maximum photochemical efficiency (variable to maximum fluorescence ratio, F v /F m ), whereas the actual quantum yield (Φ PS2 ), maximum electron transport rate (J max ) and photochemical quenching (qP) were decreased and the non photochemical quenching (NPQ) was enhanced. Under water deficit, the allocation of electrons to CO 2 assimilation was diminished by 49 % at AC and by 26 % at EC while the allocation to O 2 reduction was increased by 15 % at AC and by 12 % at EC.Additional key words: climate change, drought, electron transport allocation, Hordeum vulgare, photochemical efficiency, quantum yield.

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Section: Methodsmentioning

confidence: 99%

Influence of water stress on photosynthetic characteristics in barley plants under ambient and elevated CO<sub>2</sub> concentrations

Robredo¹,

Pérez‐López²,

Lacuesta³

et al. 2010

Biol. plant.

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“…Figure 7 shows that conversion of the xanthophyll cycle pool to the de-epoxidized forms Z + A ( Figure 7 A,B) was closely correlated with dissipation of unused light as thermal energy, as assessed from either non-photochemical fluorescence quenching (a measure of the extent of excitation energy dissipated preemptively through the regulated non-photochemical route; Figure 7 C,D) or from the decreased percentage of excitation energy that is available for utilization in photochemistry ( Figure 7 E,F) [ 48 , 49 , 50 ]. These latter two measures are mirror images of each other ( Figure 7 C–F) when thermal energy dissipation is a significant contributor to the decreased ability to use excitation energy for photochemistry.…”

Section: Xanthophyll Cycle Conversion State and Dissipation Of Unumentioning

confidence: 99%

“…V = violaxanthin. Data for sunflower are from Demmig-Adams and Adams [ 48 ] and Demmig-Adams et al [ 49 ]. Data for E. kiautschovicus are from Verhoeven et al [ 50 ].…”

Section: Figurementioning

confidence: 99%

Zeaxanthin, a Molecule for Photoprotection in Many Different Environments

et al. 2020

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Conversion of sunlight into photochemistry depends on photoprotective processes that allow safe use of sunlight over a broad range of environmental conditions. This review focuses on the ubiquity of photoprotection associated with a group of interconvertible leaf carotenoids, the xanthophyll cycle. We survey the striking plasticity of this process observed in nature with respect to (1) xanthophyll cycle pool size, (2) degree and speed of interconversion of its components, and (3) flexibility in the association between xanthophyll cycle conversion state and photoprotective dissipation of excess excitation energy. It is concluded that the components of this system can be independently tuned with a high degree of flexibility to produce a fit for different environments with various combinations of light, temperature, and other factors. In addition, the role of genetic variation is apparent from variation in the response of different species growing side-by-side in the same environment. These findings illustrate how field studies can generate insight into the adjustable levers that allow xanthophyll cycle-associated photoprotection to support plant photosynthetic productivity and survival in environments with unique combinations of environmental factors.

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“…The quantum yield of PSII ( Φ PSII ) was calculated as ( F' m – F s )/ F' m ), where F s refers to the variable fluorescence at steady state and F' m to the maximum light‐adapted fluorescence (Schindler and Lichtenthaler 1996). The photochemical ( qP ) and non‐photochemical ( NPQ ) quenching parameters were calculated as qP = ( F' m – F s )/( F' m – F' o ) being F' o the minimum light‐adapted fluorescence (Schindler and Lichtenthaler 1996) and NPQ = ( F m – F' m )/ F' m ) (Demmig‐Adams et al 1997).…”

Section: Methodsmentioning

confidence: 99%

Sorghum bicolor prioritizes the recovery of its photosynthetic activity when re‐watered after severe drought stress, while manages to preserve it under elevated CO₂ and drought

Martínez‐Goñi

Robredo

Pérez‐López

et al. 2022

J Agronomy Crop Science

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Understanding plant response and resilience to drought under a high CO2 environment will be crucial to ensure crop production in the future. Sorghum bicolor is a C4 plant that resists drought better than other crops, which could make it a good alternative to be grown under future climatic conditions. Here, we analyse the physiological response of sorghum under 350 ppm CO2 (aCO2) or 700 ppm CO2 (eCO2) with drought (D) or without drought (WW) for 9, 13 and 16 days; as well as its resilience under long (R1: 9D + 7R) or short (R2: 13D + 3R) recovery treatments. Sorghum showed elevated rates of gs under aCO2 and WW, which resulted in a significant decrease in Ψw, gs, E, ΦPSII, Fv’/Fm′ when exposed to drought. Consequently, A was greatly decreased. When re‐watered, both re‐watering treatments prioritized A recovery by restoring photosynthetic machinery under aCO2, whereas under eCO2 plants required little recovery since plant were hardly affected by drought. However, sorghum growth rate for aboveground organs did not reach control values, indicating a slower long‐term recovery. Overall, these results provide information about the resilience of sorghum and its utility as a suitable candidate for the drought episodes of the future.

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Physiology of Light Tolerance in Plants

Cited by 12 publications

References 65 publications

Influence of water stress on photosynthetic characteristics in barley plants under ambient and elevated CO<sub>2</sub> concentrations

Influence of water stress on photosynthetic characteristics in barley plants under ambient and elevated CO<sub>2</sub> concentrations

Zeaxanthin, a Molecule for Photoprotection in Many Different Environments

Sorghum bicolor prioritizes the recovery of its photosynthetic activity when re‐watered after severe drought stress, while manages to preserve it under elevated CO₂ and drought

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Physiology of Light Tolerance in Plants

Cited by 12 publications

References 65 publications

Influence of water stress on photosynthetic characteristics in barley plants under ambient and elevated CO<sub>2</sub> concentrations

Influence of water stress on photosynthetic characteristics in barley plants under ambient and elevated CO<sub>2</sub> concentrations

Zeaxanthin, a Molecule for Photoprotection in Many Different Environments

Sorghum bicolor prioritizes the recovery of its photosynthetic activity when re‐watered after severe drought stress, while manages to preserve it under elevated CO2 and drought

Contact Info

Product

Resources

About

Sorghum bicolor prioritizes the recovery of its photosynthetic activity when re‐watered after severe drought stress, while manages to preserve it under elevated CO₂ and drought