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Diverse strategies of O(2) usage for preventing photo-oxidative damage under CO(2) limitation during algal photosynthesis

Photosynthesis produces chemical energy from photon energy in the photosynthetic electron transport and assimilates CO(2) using the chemical energy. Thus, CO(2) limitation causes an accumulation of excess energy, resulting in reactive oxygen species (ROS) which can cause oxidative damage to cells. O...

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Autores principales: Shimakawa, Ginga, Matsuda, Yusuke, Nakajima, Kensuke, Tamoi, Masahiro, Shigeoka, Shigeru, Miyake, Chikahiro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5247695/
https://www.ncbi.nlm.nih.gov/pubmed/28106164
http://dx.doi.org/10.1038/srep41022
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author Shimakawa, Ginga
Matsuda, Yusuke
Nakajima, Kensuke
Tamoi, Masahiro
Shigeoka, Shigeru
Miyake, Chikahiro
author_facet Shimakawa, Ginga
Matsuda, Yusuke
Nakajima, Kensuke
Tamoi, Masahiro
Shigeoka, Shigeru
Miyake, Chikahiro
author_sort Shimakawa, Ginga
collection PubMed
description Photosynthesis produces chemical energy from photon energy in the photosynthetic electron transport and assimilates CO(2) using the chemical energy. Thus, CO(2) limitation causes an accumulation of excess energy, resulting in reactive oxygen species (ROS) which can cause oxidative damage to cells. O(2) can be used as an alternative energy sink when oxygenic phototrophs are exposed to high light. Here, we examined the responses to CO(2) limitation and O(2) dependency of two secondary algae, Euglena gracilis and Phaeodactylum tricornutum. In E. gracilis, approximately half of the relative electron transport rate (ETR) of CO(2)-saturated photosynthesis was maintained and was uncoupled from photosynthesis under CO(2) limitation. The ETR showed biphasic dependencies on O(2) at high and low O(2) concentrations. Conversely, in P. tricornutum, most relative ETR decreased in parallel with the photosynthetic O(2) evolution rate in response to CO(2) limitation. Instead, non-photochemical quenching was strongly activated under CO(2) limitation in P. tricornutum. The results indicate that these secondary algae adopt different strategies to acclimatize to CO(2) limitation, and that both strategies differ from those utilized by cyanobacteria and green algae. We summarize the diversity of strategies for prevention of photo-oxidative damage under CO(2) limitation in cyanobacterial and algal photosynthesis.
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spelling pubmed-52476952017-01-23 Diverse strategies of O(2) usage for preventing photo-oxidative damage under CO(2) limitation during algal photosynthesis Shimakawa, Ginga Matsuda, Yusuke Nakajima, Kensuke Tamoi, Masahiro Shigeoka, Shigeru Miyake, Chikahiro Sci Rep Article Photosynthesis produces chemical energy from photon energy in the photosynthetic electron transport and assimilates CO(2) using the chemical energy. Thus, CO(2) limitation causes an accumulation of excess energy, resulting in reactive oxygen species (ROS) which can cause oxidative damage to cells. O(2) can be used as an alternative energy sink when oxygenic phototrophs are exposed to high light. Here, we examined the responses to CO(2) limitation and O(2) dependency of two secondary algae, Euglena gracilis and Phaeodactylum tricornutum. In E. gracilis, approximately half of the relative electron transport rate (ETR) of CO(2)-saturated photosynthesis was maintained and was uncoupled from photosynthesis under CO(2) limitation. The ETR showed biphasic dependencies on O(2) at high and low O(2) concentrations. Conversely, in P. tricornutum, most relative ETR decreased in parallel with the photosynthetic O(2) evolution rate in response to CO(2) limitation. Instead, non-photochemical quenching was strongly activated under CO(2) limitation in P. tricornutum. The results indicate that these secondary algae adopt different strategies to acclimatize to CO(2) limitation, and that both strategies differ from those utilized by cyanobacteria and green algae. We summarize the diversity of strategies for prevention of photo-oxidative damage under CO(2) limitation in cyanobacterial and algal photosynthesis. Nature Publishing Group 2017-01-20 /pmc/articles/PMC5247695/ /pubmed/28106164 http://dx.doi.org/10.1038/srep41022 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Shimakawa, Ginga
Matsuda, Yusuke
Nakajima, Kensuke
Tamoi, Masahiro
Shigeoka, Shigeru
Miyake, Chikahiro
Diverse strategies of O(2) usage for preventing photo-oxidative damage under CO(2) limitation during algal photosynthesis
title Diverse strategies of O(2) usage for preventing photo-oxidative damage under CO(2) limitation during algal photosynthesis
title_full Diverse strategies of O(2) usage for preventing photo-oxidative damage under CO(2) limitation during algal photosynthesis
title_fullStr Diverse strategies of O(2) usage for preventing photo-oxidative damage under CO(2) limitation during algal photosynthesis
title_full_unstemmed Diverse strategies of O(2) usage for preventing photo-oxidative damage under CO(2) limitation during algal photosynthesis
title_short Diverse strategies of O(2) usage for preventing photo-oxidative damage under CO(2) limitation during algal photosynthesis
title_sort diverse strategies of o(2) usage for preventing photo-oxidative damage under co(2) limitation during algal photosynthesis
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5247695/
https://www.ncbi.nlm.nih.gov/pubmed/28106164
http://dx.doi.org/10.1038/srep41022
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