Increased capacity for photosynthesis in wheat grown at elevated CO2: the relationship between electron transport and carbon metabolism

Planta ◽  
1995 ◽  
Vol 197 (3) ◽  
Author(s):  
DimahZ. Habash ◽  
MatthewJ. Paul ◽  
MartinA.J. Parry ◽  
AlfredJ. Keys ◽  
DavidW. Lawlor
Keyword(s):  
Electron Transport ◽  
Elevated Co2 ◽  
Carbon Metabolism ◽  
The Relationship

Studies on the Relationship between Photosynthetic Electron Transport and Carbon Metabolism

1995 ◽  
pp. 1809-1812
Author(s):  
D. Z. Habash ◽  
M. A. J. Parry ◽  
M. J. Paul ◽  
S. Parmar ◽  
S. Driscoll ◽  
...  
Keyword(s):  
Electron Transport ◽  
Carbon Metabolism ◽  
Photosynthetic Electron Transport ◽  
The Relationship

On the Relationship Between Electron Transport Rate and Photosynthesis in Leaves of the C4 Plant Sorghum bicolor Exposed to Water Stress, Temperature Changes and Carbon Metabolism Inhibition

1995 ◽  
Vol 22 (6) ◽  
pp. 885 ◽  
Author(s):  
F Loreto ◽  
D Tricoli ◽  
GD Marco
Keyword(s):  
Water Stress ◽  
Electron Transport ◽  
Sorghum Bicolor ◽  
Carbon Metabolism ◽  
Sweet Sorghum ◽  
Co2 Assimilation ◽  
Linear Electron ◽  
Reaction Centres ◽  
Metabolism Inhibition ◽  
The Relationship

We examined the effect of carbon metabolism inhibition, temperature, and water stress on the relationship between the linear electron transport and photosynthetic CO2 assimilation in sweet sorghum, Sorghum bicolor (L.) Moench. Carbon metabolism was inhibited either by removing CO2 from the air or by feeding glyceraldehyde to the leaves. Irrespective of the method used, the linear electron transport and photosynthesis were coordinately inhibited. However, when photosynthesis was totally inhibited, a residual electron transport between 20 and 35 μmol m-2 s-1 could be measured. The residual electron transport increased with increasing leaf temperature up to 38�C and was higher in water-stressed leaves than in control leaves. Temperature affected photosynthesis in intact leaves. The optimal temperature for photosynthesis in control leaves was between 30 and 35�C. The ratio between linear electron transport and photosynthesis showed a temperature dependency similar to that of photosynthesis. As a consequence, the electrons required to fix one mole of CO2 were 5.5 at suboptimal temperatures but were 6.5 at 30�C. Our results indicate that the relationship between linear electron transport and photosynthesis is not perfectly steady in nature but is subject to transient changes. The observed changes in the linear electron transport were mostly related to changes in the efficiency of light trapping by open photosystem II (PSII) reaction centres, while the fractions of open PSII reaction centres were relatively constant during the experiment. Water stress severely reduced the photosynthetic CO2 assimilation of sweet sorghum leaves. The greater the water stress, the lower the temperature at which optimal photosynthesis was reached. The linear electron transport was coordinately inhibited by water stress but a residual electron transport was again found when photosynthesis was extremely reduced by water stress. Under water-stress conditions the fraction of PSII reaction centres in an open state was very low but constant, and the temperature dependent reduction of linear electron transport was caused by the reduction of the efficiency of energy capture of PSII reaction centres.

Genetic dissection of the relationship between carbon metabolism and early growth in maize, with emphasis on key-enzyme loci

1995 ◽  
Vol 1 (3) ◽  
pp. 259-272 ◽  
Author(s):  
M. Causse ◽  
J. P. Rocher ◽  
A. M. Henry ◽  
A. Charcosset ◽  
J. L. Prioul ◽  
...  
Keyword(s):  
Carbon Metabolism ◽  
Early Growth ◽  
Genetic Dissection ◽  
Enzyme Loci ◽  
Key Enzyme ◽  
The Relationship

Oxygen-sensitive Differences in the Relationship between Photosynthetic Electron Transport and CO2 Assimilation in C3 and C4 Plants during State Transitions

1997 ◽  
Vol 24 (4) ◽  
pp. 495 ◽  
Author(s):  
James R. Andrews ◽  
Neil R. Baker
Keyword(s):  
Electron Transport ◽  
Quantum Efficiency ◽  
Photosynthetic Electron Transport ◽  
Co2 Assimilation ◽  
State Transitions ◽  
Large Decrease ◽  
Maize Leaves ◽  
Significant Change ◽  
The Relationship ◽  
State 1

Wheat (C3) and maize (C4) leaves were exposed to light treatments that were limiting for CO2 assimilation and which excite preferentially photosystem I (PSI) or photosystem II (PSII) and induce State 1 or State 2, respectively. In order to examine the relationships between linear electron transport and CO2 in leaves during State transitions, simultaneous measurements of CO2 assimilation, chlorophyll fluorescence and absorbance at 820 nm were used to estimate the quantum efficiencies of CO2 assimilation and PSII and PSI photochemistry. In wheat leaves with photorespiratory activity, no significant change in quantum efficiency of CO2assimilation was observed during State transitions. This was not the case when photorespiration was inhibited with either 2% O2 or 1000 ppm CO2 and transition from State 2 to State 1 was accompanied by a large decrease (c. 20%) in the quantum efficiency of CO2 assimilation which was not associated with a decrease in the quantum efficiency of electron transport through PSII. Photorespiration appears to buffer the quantum efficiency of CO2 assimilation from changes associated with decreases in the rate of CO2 fixation resulting from imbalances in PPFD absorption by PSI and PSII. When maize leaves were subjected to similar State transitions, no significant change in the quantum efficiency of CO2 assimilation was observed on transition from State 2 to State 1, but on switching back to State 2 a very large decrease (c. 40%) was observed. This decrease could be prevented if leaves were maintained in either 2% O2 or 593 ppm CO2. The possible occurrence of photorespiration in maize leaves on transition from State 1 to State 2, which could result from an inhibition of the CO2 concentrating mechanism, cannot account for the decrease in the quantum efficiency of CO2 assimilation since the relationship between PSII electron transport and CO2 assimilation remained similar throughout the State transitions. Also changes in the phosphorylation status of the light-harvesting chlorophyll a/b protein associated with PSII cannot be implicated in this phenomenon.

Roles of heat shock protein and reprogramming of photosynthetic carbon metabolism in thermotolerance under elevated CO2 in maize

2019 ◽  
Vol 168 ◽  
pp. 103869 ◽  
Author(s):  
Jikai Li ◽  
Jemaa Essemine ◽  
James A. Bunce ◽  
Chen Shang ◽  
Hailing Zhang ◽  
...  
Keyword(s):  
Heat Shock ◽  
Heat Shock Protein ◽  
Elevated Co2 ◽  
Carbon Metabolism ◽  
Photosynthetic Carbon ◽  
Photosynthetic Carbon Metabolism

scholarly journals The Role of Plastocyanin in the Adjustment of the Photosynthetic Electron Transport to the Carbon Metabolism in Tobacco

2004 ◽  
Vol 136 (4) ◽  
pp. 4265-4274 ◽  
Author(s):  
Mark Aurel Schöttler ◽  
Helmut Kirchhoff ◽  
Engelbert Weis
Keyword(s):  
Electron Transport ◽  
Carbon Metabolism ◽  
Photosynthetic Electron Transport
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