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Cyclic vs Noncyclic Photophosphorylation | …

Jan 09, 2008 · What are the Cyclic and Non-Cyclic Pathways in Photosynthesis

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Cyclic Photophosphorylation vs Non-cyclic ..

Pathways of higher plant photosynthetic electron transport. Higher plant photosynthetic electron transport takes place in the chloroplast in the thylakoid membrane. Linear electron transport starts with the light‐driven splitting of water by photosystem II (PSII), producing oxygen and electrons. These are transferred via plastoquinone (PQ) the cytochrome b/f complex (cyt ) and plastocyanin (PC) to photosystem I (PSI). PSI then reduces ferredoxin (Fd) in a second light‐driven reaction. Ferredoxin may reduce NADP to NADPH, catalysed by ferredoxin NADP oxidoreductase (FNR) or pass electrons back to PQ, probably via the cyt b/f complex. NADPH may be used to produce carbohydrate in the Benson–Calvin cycle or may reduce PQ, via an NADP–PQ oxidoreductase complex (ndh). Electron transport is coupled to the transfer of protons from the chloroplast stroma to the thylakoid lumen. These return to the stroma via ATP synthase, a process coupled to the synthesis of ATP. The pH gradient produced may also lead to downregulation of light harvesting by PSII – a process termed qE.

Cyclic vs. Noncyclic Cycles in Photosynthesis?

Joët T, Cournac L, Peltier G and Havaux M (2002a) Cyclic electron flow around photosystem I in C‐3 plants. In vivo control by the redox state of chloroplasts and involvement of the NADH‐dehydrogenase complex. Plant Physiology 128: 760–769.

Noncyclic Cycles in Photosynthesis

Harbinson J and Foyer CH (1991) Relationships between the efficiencies of photosystem‐I and photosystem‐II and stromal redox state in carbon dioxide‐free air – evidence for cyclic electron flow in vivo. Plant Physiology 97: 41–49.

Oxygenic photosynthesis occurs in, among others, eukaryotic microorganisms like algae and in bacteria such as cyanobacteria; the same mechanism is at work in both. Electron flow happens through two different electron transport chains that are connected; together, these electron transport chains are called the . The stars of each chain are photosystem I (PSI) and photosystem II (PSII), each containing chlorophyll reaction centers surrounded by antenna pigments.

What's the difference between cyclic and noncylic respiration

Breyton C, Nandha B, Johnson GN, Joliot P and Finazzi G (2006) Redox modulation of cyclic electron flow around photosystem I in C3 plants. Biochemistry 45: 13465–13475.

Laisk A, Eichelmann H, Oja V, Rasulov B and Ramma H (2006) Photosystem II cycle and alternative electron flow in leaves. Plant and Cell Physiology 47: 972–983.

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  • with noncyclic electron flow alone

    Non-cyclic photophosphorylation is a two-stage process that involves two different chlorophyll photosystems

  • Cyclic and Noncyclic Photophosphorylation

    What causes cyclic photophosphorylation in photosynthesis?

  • What is non-cyclic photosynthesis and how is ..

    08/09/2016 · What causes cyclic photophosphorylation in photosynthesis

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between cyclic and noncyclic photosynthesis?

Cyclic electron transport is a light‐driven flow of electrons through a photosynthetic reaction centre with the electrons returning to the reaction centre via an electron transport pathway. Cyclic electron transport will normally generate an electrochemical potential (typically pH) gradient across a membrane but does not result in the net production of reductant. The pH gradient generated may drive the production of adenosine triphosphate (ATP) (cyclic photophosphorylation) or may regulate photosynthesis.

Non-cyclic Photophosphorylation ..

Cyclic electron flow avoids both and the donation of electrons to +. instead are passed from to an , resulting in , and then returned to , returning that to its ground state. Also can be described as a .

This cyclical process is rather than those being originally sourced from . The process is described as cyclical because rather than flowing from one component of the to another ( to +), they instead cycle back to the same component ( to ).

Photosynthesis Non Cyclic Electron Flow Flashcards | …

Miyake C, Horiguchi S, Makino A et al. (2005) Effects of light intensity on cyclic electron flow around PSI and its relationship to non‐photochemical quenching of Chl fluorescence in tobacco leaves. Plant and Cell Physiology 46: 1819–1830.

Cyclic Vs Non-Cyclic Photophosphorylation - Compare …

Munekage Y, Hojo M, Meurer J et al. (2002) PGR5 is involved in cyclic electron flow around photosystem I and is essential for photoprotection in Arabidopsis. Cell 110: 361–371.

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