Cyclic Electron Transport Around Photosystem I: Genetic Approaches

Shikanai, Toshiharu

doi:10.1146/annurev.arplant.58.091406.110525

Cited by 479 publications

(407 citation statements)

References 91 publications

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“…Numerous aspects of cyclic operation of PSI have been recently investigated, both on isolated photosynthetic membranes and in vivo [10][11][12][13]. However, the parameters controlling the extent and kinetics of ΔpH and Δψ when PSI is reconstituted in liposomes were not thoroughly investigated yet.…”

Section: Introductionmentioning

confidence: 99%

Analysis of light-induced transmembrane ion gradients and membrane potential in Photosystem I proteoliposomes

Pennisi

Greenbaum

Yoshida

2010

Biophysical Chemistry

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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Section: Introductionmentioning

confidence: 99%

Analysis of light-induced transmembrane ion gradients and membrane potential in Photosystem I proteoliposomes

Pennisi

Greenbaum

Yoshida

2010

Biophysical Chemistry

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“…There is also a cyclic electron transport that depends on the PSI photochemical reactions and also passes through the Cyt b 6 /f complex. The cyclic electron transport can generate a DpH and drives ATP synthesis by ATP synthase without concomitant generation of NADPH (Shikanai, 2007). ATP and NADPH generated by light reactions are utilized primarily in the Calvin cycle and photorespiratory cycle.…”

mentioning

confidence: 99%

The Roles of ATP Synthase and the Cytochrome b 6/f Complexes in Limiting Chloroplast Electron Transport and Determining Photosynthetic Capacity

et al. 2010

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In C 3 plants, CO 2 assimilation is limited by ribulose 1,5-bisphosphate (RuBP) regeneration rate at high CO 2 . RuBP regeneration rate in turn is determined by either the chloroplast electron transport capacity to generate NADPH and ATP or the activity of Calvin cycle enzymes involved in regeneration of RuBP. Here, transgenic tobacco (Nicotiana tabacum 'W38') expressing an antisense gene directed at the transcript of either the Rieske iron-sulfur protein of the cytochrome (Cyt) b 6 /f complex or the d-subunit of chloroplast ATP synthase have been used to investigate the effect of a reduction of these complexes on chloroplast electron transport rate (ETR). Reductions in d-subunit of ATP synthase content did not alter chlorophyll, Cyt b 6 /f complex, or Rubisco content, but reduced ETR estimated either from measurements of chlorophyll fluorescence or CO 2 assimilation rates at high CO 2 . Plants with low ATP synthase content exhibited higher nonphotochemical quenching and achieved higher ETR per ATP synthase than the wild type. The proportional increase in ETR per ATP synthase complex was greatest at 35°C, showing that the ATP synthase activity can vary in vivo. In comparison, there was no difference in the ETR per Cyt b 6 /f complex in plants with reduced Cyt b 6 /f content and the wild type. The ETR decreased more drastically with reductions in Cyt b 6 /f complex than ATP synthase content. This suggests that chloroplast ETR is more limited by Cyt b 6 /f than ATP synthase content and is a potential target for enhancing photosynthetic capacity in crops.Plants capture light energy with their light-harvesting systems, including chlorophylls (Chls) and carotenoids, and drive photosynthetic electron transport through the thylakoid membranes of the chloroplasts. Electrons excised from water in PSII are ultimately transferred to NADP + via PSI, resulting in production of NADPH. This process is known as linear electron transport. At the same time, this linear electron transport that passes through the cytochrome (Cyt) b 6 /f complex generates a proton gradient across the thylakoid membrane (DpH;Allen, 2003). Together with the proton gradient generated by the water-splitting complex associated with PSII, these proton gradients enable ATP production by the ATP synthase complex and help to regulate nonphotochemical quenching (NPQ) of excitation energy (Mü ller et al., 2001). There is also a cyclic electron transport that depends on the PSI photochemical reactions and also passes through the Cyt b 6 /f complex. The cyclic electron transport can generate a DpH and drives ATP synthesis by ATP synthase without concomitant generation of NADPH (Shikanai, 2007). ATP and NADPH generated by light reactions are utilized primarily in the Calvin cycle and photorespiratory cycle. The activity and regulation of the Cyt b 6 /f complex and the ATP synthase are thus key components determining the rate of NADPH and ATP production for CO 2 fixation. Photosynthetic CO 2 assimilation rate can be viewed as being limited either by the capacity o...

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“…DCMU impedes electron transport after Q A which is the PSII primary acceptor (Munekage et al, 2002;Gao et al, 2013). MV suppresses Fd-dependent CEF around PSI by accepting electrons from PSI (Shikanai, 2007;Setif, 2015). The data for the different treatments are given in Table 1.…”

Section: Plant Materials and Study Designmentioning

confidence: 99%

“…CEF can oxidize pigment molecule of PSI reaction center (P700) into oxidized pigment molecule of PSI reaction center (P700 + ) and dispel superfluous NADPH reducing power. Simultaneously, the electrons brought to PSI can be decreased by the PSII reaction center closure (Munekage et al, 2002;Shikanai, 2007;2014). Up to 30% of photosynthetic electrons can be consumed by CEF in higher plants, and in green algae, especially in light stress conditions the utilization proportion is larger (Tu et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Response of linear and cyclic electron flux to moderate high temperature and high light stress in tomato

Shi

Sun

et al. 2017

J. Zhejiang Univ. Sci. B

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With prolonged DCMU treatment time, electron transport rate and quantum efficiency of PSI (ETR I and Y I ) significantly decreased whereas acceptor and donor side limitation of PSI (Y NA and Y ND ) increased. MV led to a significant decline and accession of yield of regulated and non-regulated energy Y NPQ and Y NO , respectively. Membrane integrity and ATPase activity were reduced by HH stress, and DCMU and MV enhanced inhibitory actions. Conclusions: The protective effects of CEF and LEF were mediated to a certain degree by meliorations in energy absorption and distribution as well as by maintenance of thylakoid membrane integrity and ATPase activity.

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Cyclic Electron Transport Around Photosystem I: Genetic Approaches

Cited by 479 publications

References 91 publications

Analysis of light-induced transmembrane ion gradients and membrane potential in Photosystem I proteoliposomes

Analysis of light-induced transmembrane ion gradients and membrane potential in Photosystem I proteoliposomes

The Roles of ATP Synthase and the Cytochrome b 6/f Complexes in Limiting Chloroplast Electron Transport and Determining Photosynthetic Capacity

Response of linear and cyclic electron flux to moderate high temperature and high light stress in tomato

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