Difference between revisions of "Chlororespiration"
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|description=''' | |description=In '''chlororespiration''' oxygen is consumed by a putative respiratory electron transfer system (ETS) within the thylakoid membrane of the [[chloroplasts]] and ATP is produced. It is a process that involves the interaction with the photosynthetic ETS in which NAD(P)H dehydrogenase transfers electrons to oxygen with the assistance of the photosynthetic plastoquinone (PQ), which acts as a non-photochemical redox carrier. Initially described in the unicellular alga ''Chlamydomonas reindhartdii'', chlororespiration was highly disputed for years until the discovery of a NAD(P)H-dehydrogenase (NDH) complex (plastidic encoded) and plastid terminal oxidase (PTOX) (nuclear encoded) in higher-plant chloroplasts. PTOX is homologous to the plant mitochondrial alternative oxidase and has the role of preventing the over-reduction of the PQ pool while the NDH complexes provide a gateway for the electrons to form the ETS and consume oxygen. As a result of this process there is a cyclic electron flow around Photosystem I (PSI) that is activated under stress conditions acting as a photoprotection mechanism and could be involved in protecting against oxidative stress. | ||
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== References == | == References == | ||
::::* Quiles MJ (2006) Stimulation of chlororespiration by heat and high light intensity in oat plants. Plant, Cell and Environment - [ | ::::* Quiles MJ (2006) Stimulation of chlororespiration by heat and high light intensity in oat plants. Plant, Cell and Environment. - [[Quiles_2006_Plant_Cell_Environ |»Bioblast link«]] | ||
::::* Peltier G, Cournat L (2002) Chlororespiration. Annual Review Plant Biol. - [[Peltier 2002 Ann Rev Plant Biol |»Bioblast link«]] | |||
::::* Peltier G, Cournat L (2002) Chlororespiration. Annual | |||
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{{Template:Keywords: PhotoBiology and plant physiology}} | {{Template:Keywords: PhotoBiology and plant physiology}} |
Latest revision as of 09:42, 11 September 2021
Description
In chlororespiration oxygen is consumed by a putative respiratory electron transfer system (ETS) within the thylakoid membrane of the chloroplasts and ATP is produced. It is a process that involves the interaction with the photosynthetic ETS in which NAD(P)H dehydrogenase transfers electrons to oxygen with the assistance of the photosynthetic plastoquinone (PQ), which acts as a non-photochemical redox carrier. Initially described in the unicellular alga Chlamydomonas reindhartdii, chlororespiration was highly disputed for years until the discovery of a NAD(P)H-dehydrogenase (NDH) complex (plastidic encoded) and plastid terminal oxidase (PTOX) (nuclear encoded) in higher-plant chloroplasts. PTOX is homologous to the plant mitochondrial alternative oxidase and has the role of preventing the over-reduction of the PQ pool while the NDH complexes provide a gateway for the electrons to form the ETS and consume oxygen. As a result of this process there is a cyclic electron flow around Photosystem I (PSI) that is activated under stress conditions acting as a photoprotection mechanism and could be involved in protecting against oxidative stress.
References
- Quiles MJ (2006) Stimulation of chlororespiration by heat and high light intensity in oat plants. Plant, Cell and Environment. - »Bioblast link«
- Peltier G, Cournat L (2002) Chlororespiration. Annual Review Plant Biol. - »Bioblast link«
- Bioblast links: PhotoBiology and plant physiology - >>>>>>> - Click on [Expand] or [Collapse] - >>>>>>>
PhotoBiology: photosynthesis
Plant physiology: respiration
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