Divergent physiological and molecular responses of light‐ and iron‐limited Southern Ocean phytoplankton
Abstract It has recently been shown that Southern Ocean phytoplankton species have evolved to optimize their light‐harvesting potential without increasing the high iron‐requiring proteins used for photosynthesis. We measured molecular and physiological responses of phytoplankton cultures under a com...
Published in: | Limnology and Oceanography Letters |
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crwiley:10.1002/lol2.10223 2024-06-02T08:14:42+00:00 Divergent physiological and molecular responses of light‐ and iron‐limited Southern Ocean phytoplankton Andrew, Sarah M. Strzepek, Robert F. M. Whitney, Spencer Chow, Wah Soon Ellwood, Michael J. Australian Research Council 2021 http://dx.doi.org/10.1002/lol2.10223 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lol2.10223 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lol2.10223 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lol2.10223 en eng Wiley http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ Limnology and Oceanography Letters volume 7, issue 2, page 150-158 ISSN 2378-2242 2378-2242 journal-article 2021 crwiley https://doi.org/10.1002/lol2.10223 2024-05-03T11:36:46Z Abstract It has recently been shown that Southern Ocean phytoplankton species have evolved to optimize their light‐harvesting potential without increasing the high iron‐requiring proteins used for photosynthesis. We measured molecular and physiological responses of phytoplankton cultures under a combination of iron and light conditions. While iron‐replete cultures mostly increased biovolume, photochemical efficiency ( F v / F m ) and the relative abundance of photosystem II (PSII) and Cytochrome b 6 f protein compared to iron‐limited cultures, light also regulated cellular chlorophyll a content and played a role in controlling PSII protein abundance. Investment of protein resources into the carbon fixing enzyme Ribulose 1,5‐bisphosphate carboxylase oxygenase (Rubisco) was species‐specific, but increased growth rates correlated with increased investment into Rubisco for all species. Our results suggest that Proboscia inermis uses a divergent molecular strategy to compete for nutrients, light, and CO 2 in the Southern Ocean. Article in Journal/Newspaper Southern Ocean Wiley Online Library Southern Ocean Limnology and Oceanography Letters |
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Wiley Online Library |
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language |
English |
description |
Abstract It has recently been shown that Southern Ocean phytoplankton species have evolved to optimize their light‐harvesting potential without increasing the high iron‐requiring proteins used for photosynthesis. We measured molecular and physiological responses of phytoplankton cultures under a combination of iron and light conditions. While iron‐replete cultures mostly increased biovolume, photochemical efficiency ( F v / F m ) and the relative abundance of photosystem II (PSII) and Cytochrome b 6 f protein compared to iron‐limited cultures, light also regulated cellular chlorophyll a content and played a role in controlling PSII protein abundance. Investment of protein resources into the carbon fixing enzyme Ribulose 1,5‐bisphosphate carboxylase oxygenase (Rubisco) was species‐specific, but increased growth rates correlated with increased investment into Rubisco for all species. Our results suggest that Proboscia inermis uses a divergent molecular strategy to compete for nutrients, light, and CO 2 in the Southern Ocean. |
author2 |
Australian Research Council |
format |
Article in Journal/Newspaper |
author |
Andrew, Sarah M. Strzepek, Robert F. M. Whitney, Spencer Chow, Wah Soon Ellwood, Michael J. |
spellingShingle |
Andrew, Sarah M. Strzepek, Robert F. M. Whitney, Spencer Chow, Wah Soon Ellwood, Michael J. Divergent physiological and molecular responses of light‐ and iron‐limited Southern Ocean phytoplankton |
author_facet |
Andrew, Sarah M. Strzepek, Robert F. M. Whitney, Spencer Chow, Wah Soon Ellwood, Michael J. |
author_sort |
Andrew, Sarah M. |
title |
Divergent physiological and molecular responses of light‐ and iron‐limited Southern Ocean phytoplankton |
title_short |
Divergent physiological and molecular responses of light‐ and iron‐limited Southern Ocean phytoplankton |
title_full |
Divergent physiological and molecular responses of light‐ and iron‐limited Southern Ocean phytoplankton |
title_fullStr |
Divergent physiological and molecular responses of light‐ and iron‐limited Southern Ocean phytoplankton |
title_full_unstemmed |
Divergent physiological and molecular responses of light‐ and iron‐limited Southern Ocean phytoplankton |
title_sort |
divergent physiological and molecular responses of light‐ and iron‐limited southern ocean phytoplankton |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/lol2.10223 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lol2.10223 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lol2.10223 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lol2.10223 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Limnology and Oceanography Letters volume 7, issue 2, page 150-158 ISSN 2378-2242 2378-2242 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/lol2.10223 |
container_title |
Limnology and Oceanography Letters |
_version_ |
1800738661515395072 |