Chlororespiration: Difference between revisions
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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 |Β»Bioblast linkΒ«]] | ||
Β | ::::* Peltier G, Cournat L (2002) Chlororespiration. Annual Review Plant Biol. - [[Peltier 2002 Ann Rev Plant Biol |Β»Bioblast linkΒ«]] | ||
::::* Peltier G, Cournat L (2002) Chlororespiration. Annual | |||
{{NextGen-O2k H2020-support}} | {{NextGen-O2k H2020-support}} | ||
{{Template:Keywords: PhotoBiology and plant physiology}} | {{Template:Keywords: PhotoBiology and plant physiology}} |
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 - Β»Bioblast linkΒ«
- Peltier G, Cournat L (2002) Chlororespiration. Annual Review Plant Biol. - Β»Bioblast linkΒ«
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