| Title |
Dark inactivation of ferredoxin-NADP reductase and cyclic electron flow under far-red light in sunflower leaves
|
|---|---|
| Published in |
Photosynthesis Research, July 2007
|
| DOI | 10.1007/s11120-007-9224-7 |
| Pubmed ID | |
| Authors |
Eero Talts, Vello Oja, Heikko Rämma, Bahtijor Rasulov, Agu Anijalg, Agu Laisk |
| Abstract |
The oxidation kinetics under far-red light (FRL) of photosystem I (PSI) high potential donors P700, plastocyanin (PC), and cytochrome f (Cyt f) were investigated in sunflower leaves with the help of a new high-sensitivity photometer at 810 nm. The slopes of the 810 nm signal were measured immediately before and after FRL was turned on or off. The same derivatives (slopes) were calculated from a mathematical model based on redox equilibrium between P700, PC and Cyt f and the parameters of the model were varied to fit the model to the measurements. Typical best-fit pool sizes were 1.0-1.5 micromol m(-2) of P700, 3 PC/P700 and 1 Cyt f/P700, apparent equilibrium constants were 15 between P700 and PC and 3 between PC and Cyt f. Cyclic electron flow (CET) was calculated from the slope of the signal after FRL was turned off. CET activated as soon as electrons accumulated on the PSI acceptor side. The quantum yield of CET was close to unity. Consequently, all PSI in the leaf were able to perform in cycle, questioning the model of compartmentation of photosynthetic functions between the stroma and grana thylakoids. The induction of CET was very fast, showing that it was directly redox-controlled. After longer dark exposures CET dominated, because linear e- transport was temporarily hindered by the dark inactivation of ferredoxin-NADP reductase. |
Mendeley readers
The data shown below were compiled from readership statistics for 23 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| South Africa | 1 | 4% |
| Unknown | 22 | 96% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Researcher | 5 | 22% |
| Student > Ph. D. Student | 4 | 17% |
| Professor | 2 | 9% |
| Student > Master | 2 | 9% |
| Student > Doctoral Student | 1 | 4% |
| Other | 4 | 17% |
| Unknown | 5 | 22% |
| Readers by discipline | Count | As % |
|---|---|---|
| Agricultural and Biological Sciences | 12 | 52% |
| Biochemistry, Genetics and Molecular Biology | 2 | 9% |
| Unspecified | 1 | 4% |
| Environmental Science | 1 | 4% |
| Computer Science | 1 | 4% |
| Other | 2 | 9% |
| Unknown | 4 | 17% |
Attention Score in Context
This research output has an Altmetric Attention Score of 3. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 30 July 2021.
All research outputs
#7,454,066
of 22,788,370 outputs
Outputs from Photosynthesis Research
#195
of 769 outputs
Outputs of similar age
#24,222
of 66,617 outputs
Outputs of similar age from Photosynthesis Research
#3
of 9 outputs
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So far Altmetric has tracked 769 research outputs from this source. They receive a mean Attention Score of 3.7. This one is in the 41st percentile – i.e., 41% of its peers scored the same or lower than it.
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