Photoacclimation of the polar diatom Chaetoceros neogracilis at low temperature
Polar microalgae face two major challenges: 1- growing at temperatures (-1.7 to 5°C) that limit enzyme kinetics; and 2- surviving and exploiting a wide range of irradiance. The objective of this study is to understand the adaptation of an Arctic diatom to its environment by studying its ability to a...
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ftarchimer:oai:archimer.ifremer.fr:90563 2023-05-15T15:07:56+02:00 Photoacclimation of the polar diatom Chaetoceros neogracilis at low temperature Lacour, Thomas Larivière, Jade Ferland, Joannie Morin, Philippe-israël Grondin, Pierre-luc Donaher, Natalie Cockshutt, Amanda Campbell, Douglas A. Babin, Marcel 2022-09 application/pdf https://archimer.ifremer.fr/doc/00794/90563/96135.pdf https://archimer.ifremer.fr/doc/00794/90563/96136.docx https://archimer.ifremer.fr/doc/00794/90563/96137.docx https://archimer.ifremer.fr/doc/00794/90563/96138.docx https://archimer.ifremer.fr/doc/00794/90563/96139.docx https://archimer.ifremer.fr/doc/00794/90563/96140.docx https://archimer.ifremer.fr/doc/00794/90563/96141.docx https://archimer.ifremer.fr/doc/00794/90563/96142.docx https://archimer.ifremer.fr/doc/00794/90563/96143.docx https://archimer.ifremer.fr/doc/00794/90563/96144.docx https://archimer.ifremer.fr/doc/00794/90563/96145.docx https://doi.org/10.1371/journal.pone.0272822 https://archimer.ifremer.fr/doc/00794/90563/ eng eng Public Library of Science (PLoS) https://archimer.ifremer.fr/doc/00794/90563/96135.pdf https://archimer.ifremer.fr/doc/00794/90563/96136.docx https://archimer.ifremer.fr/doc/00794/90563/96137.docx https://archimer.ifremer.fr/doc/00794/90563/96138.docx https://archimer.ifremer.fr/doc/00794/90563/96139.docx https://archimer.ifremer.fr/doc/00794/90563/96140.docx https://archimer.ifremer.fr/doc/00794/90563/96141.docx https://archimer.ifremer.fr/doc/00794/90563/96142.docx https://archimer.ifremer.fr/doc/00794/90563/96143.docx https://archimer.ifremer.fr/doc/00794/90563/96144.docx https://archimer.ifremer.fr/doc/00794/90563/96145.docx doi:10.1371/journal.pone.0272822 https://archimer.ifremer.fr/doc/00794/90563/ info:eu-repo/semantics/openAccess restricted use Plos One (1932-6203) (Public Library of Science (PLoS)), 2022-09 , Vol. 17 , N. 9 , P. e0272822 (20p.) text Publication info:eu-repo/semantics/article 2022 ftarchimer https://doi.org/10.1371/journal.pone.0272822 2023-03-14T23:55:22Z Polar microalgae face two major challenges: 1- growing at temperatures (-1.7 to 5°C) that limit enzyme kinetics; and 2- surviving and exploiting a wide range of irradiance. The objective of this study is to understand the adaptation of an Arctic diatom to its environment by studying its ability to acclimate to changes in light and temperature. We acclimated the polar diatom Chaetoceros neogracilis to various light levels at two different temperatures and studied its growth and photosynthetic properties using semi-continuous cultures. Rubisco content was high, to compensate for low catalytic rates, but did not change detectably with growth temperature. Contrary to what is observed in temperate species, in C. neogracilis, carbon fixation rate (20 min 14C incorporation) equaled net growth rate (μ) suggesting very low or very rapid (<20 min) re-oxidation of the newly fixed carbon. The comparison of saturation irradiances for electron transport, oxygen net production and carbon fixation revealed alternative electron pathways that could provide energy and reducing power to the cell without consuming organic carbon which is a very limiting product at low temperatures. High protein contents, low re-oxidation of newly fixed carbon and the use of electron pathways alternative to carbon fixation may be important characteristics allowing efficient growth under those extreme environmental conditions. Article in Journal/Newspaper Arctic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Arctic PLOS ONE 17 9 e0272822 |
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Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
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ftarchimer |
language |
English |
description |
Polar microalgae face two major challenges: 1- growing at temperatures (-1.7 to 5°C) that limit enzyme kinetics; and 2- surviving and exploiting a wide range of irradiance. The objective of this study is to understand the adaptation of an Arctic diatom to its environment by studying its ability to acclimate to changes in light and temperature. We acclimated the polar diatom Chaetoceros neogracilis to various light levels at two different temperatures and studied its growth and photosynthetic properties using semi-continuous cultures. Rubisco content was high, to compensate for low catalytic rates, but did not change detectably with growth temperature. Contrary to what is observed in temperate species, in C. neogracilis, carbon fixation rate (20 min 14C incorporation) equaled net growth rate (μ) suggesting very low or very rapid (<20 min) re-oxidation of the newly fixed carbon. The comparison of saturation irradiances for electron transport, oxygen net production and carbon fixation revealed alternative electron pathways that could provide energy and reducing power to the cell without consuming organic carbon which is a very limiting product at low temperatures. High protein contents, low re-oxidation of newly fixed carbon and the use of electron pathways alternative to carbon fixation may be important characteristics allowing efficient growth under those extreme environmental conditions. |
format |
Article in Journal/Newspaper |
author |
Lacour, Thomas Larivière, Jade Ferland, Joannie Morin, Philippe-israël Grondin, Pierre-luc Donaher, Natalie Cockshutt, Amanda Campbell, Douglas A. Babin, Marcel |
spellingShingle |
Lacour, Thomas Larivière, Jade Ferland, Joannie Morin, Philippe-israël Grondin, Pierre-luc Donaher, Natalie Cockshutt, Amanda Campbell, Douglas A. Babin, Marcel Photoacclimation of the polar diatom Chaetoceros neogracilis at low temperature |
author_facet |
Lacour, Thomas Larivière, Jade Ferland, Joannie Morin, Philippe-israël Grondin, Pierre-luc Donaher, Natalie Cockshutt, Amanda Campbell, Douglas A. Babin, Marcel |
author_sort |
Lacour, Thomas |
title |
Photoacclimation of the polar diatom Chaetoceros neogracilis at low temperature |
title_short |
Photoacclimation of the polar diatom Chaetoceros neogracilis at low temperature |
title_full |
Photoacclimation of the polar diatom Chaetoceros neogracilis at low temperature |
title_fullStr |
Photoacclimation of the polar diatom Chaetoceros neogracilis at low temperature |
title_full_unstemmed |
Photoacclimation of the polar diatom Chaetoceros neogracilis at low temperature |
title_sort |
photoacclimation of the polar diatom chaetoceros neogracilis at low temperature |
publisher |
Public Library of Science (PLoS) |
publishDate |
2022 |
url |
https://archimer.ifremer.fr/doc/00794/90563/96135.pdf https://archimer.ifremer.fr/doc/00794/90563/96136.docx https://archimer.ifremer.fr/doc/00794/90563/96137.docx https://archimer.ifremer.fr/doc/00794/90563/96138.docx https://archimer.ifremer.fr/doc/00794/90563/96139.docx https://archimer.ifremer.fr/doc/00794/90563/96140.docx https://archimer.ifremer.fr/doc/00794/90563/96141.docx https://archimer.ifremer.fr/doc/00794/90563/96142.docx https://archimer.ifremer.fr/doc/00794/90563/96143.docx https://archimer.ifremer.fr/doc/00794/90563/96144.docx https://archimer.ifremer.fr/doc/00794/90563/96145.docx https://doi.org/10.1371/journal.pone.0272822 https://archimer.ifremer.fr/doc/00794/90563/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Plos One (1932-6203) (Public Library of Science (PLoS)), 2022-09 , Vol. 17 , N. 9 , P. e0272822 (20p.) |
op_relation |
https://archimer.ifremer.fr/doc/00794/90563/96135.pdf https://archimer.ifremer.fr/doc/00794/90563/96136.docx https://archimer.ifremer.fr/doc/00794/90563/96137.docx https://archimer.ifremer.fr/doc/00794/90563/96138.docx https://archimer.ifremer.fr/doc/00794/90563/96139.docx https://archimer.ifremer.fr/doc/00794/90563/96140.docx https://archimer.ifremer.fr/doc/00794/90563/96141.docx https://archimer.ifremer.fr/doc/00794/90563/96142.docx https://archimer.ifremer.fr/doc/00794/90563/96143.docx https://archimer.ifremer.fr/doc/00794/90563/96144.docx https://archimer.ifremer.fr/doc/00794/90563/96145.docx doi:10.1371/journal.pone.0272822 https://archimer.ifremer.fr/doc/00794/90563/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1371/journal.pone.0272822 |
container_title |
PLOS ONE |
container_volume |
17 |
container_issue |
9 |
container_start_page |
e0272822 |
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1766339358842945536 |