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.
journal_name
Photosynth Resjournal_title
Photosynthesis researchauthors
Talts E,Oja V,Rämma H,Rasulov B,Anijalg A,Laisk Adoi
10.1007/s11120-007-9224-7subject
Has Abstractpub_date
2007-10-01 00:00:00pages
109-20issue
1eissn
0166-8595issn
1573-5079journal_volume
94pub_type
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pub_type: 杂志文章
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journal_title:Photosynthesis research
pub_type: 杂志文章
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journal_title:Photosynthesis research
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journal_title:Photosynthesis research
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00032261
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:2006-06-01 00:00:00
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pub_type: 杂志文章
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journal_title:Photosynthesis research
pub_type:
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更新日期:2013-07-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00033161
更新日期:1990-09-01 00:00:00
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pub_type: 杂志文章
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更新日期:2006-04-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章
doi:10.1007/BF00032823
更新日期:1993-09-01 00:00:00
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journal_title:Photosynthesis research
pub_type: 杂志文章,评审
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更新日期:2018-08-01 00:00:00
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pub_type: 杂志文章
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