Difference between revisions of "Chlororespiration"

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{{MitoPedia
{{MitoPedia
|abbr=
|abbr=
|description='''Chlororespiration'''  
|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.
is the phenomenon by which oxygen is consumed by a putative respiratory electron transfer chain (ETC) within the thylakoid membrane of the [[chloroplasts]] and ATP is produced. It is a process that involves the interaction with the photosynthetic ETC in which the NAD(P)H dehydrogenase enzyme transfers electrons to oxygen molecules 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. The PTOX, which is homologous to the plant mitochondrial alternative oxidase, 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 ETC and consume oxygen. As a result of this process there is a cyclic electron flow around the Photosystem I (PSI) that has been reported to be activated under stress conditions acting as a photoprotection mechanism and could be involved in protecting against any other stress that implies the increase of ROS formation.
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Communicated by [[Huete-Ortega M]] 2020-06-30


== References ==
== References ==
::::* Quiles MJ (2006) Stimulation of chlororespiration by heat and high light intensity in oat plants. Plant, Cell and Environment - [https://wiki.oroboros.at/index.php/Quiles_Plant_Cell_and_Environment Bioblast link]
::::* 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 review of plant biology - [https://wiki.oroboros.at/index.php/Peltier_G_Annual_Review_of_plant_biology Bioblast link]


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Revision as of 09:42, 11 September 2021

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Chlororespiration

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«
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