Interacting Effects of Light and Iron Availability on the Coupling of Photosynthetic Electron Transport and CO2-Assimilation in Marine Phytoplankton.
Iron availability directly affects photosynthesis and limits phytoplankton growth over vast oceanic regions. For this reason, the availability of iron is a crucial variable to consider in the development of active chlorophyll a fluorescence based estimates of phytoplankton primary productivity. Thes...
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ftdoajarticles:oai:doaj.org/article:08018074b6be4711b5b2d202788f78a2 2023-05-15T18:28:30+02:00 Interacting Effects of Light and Iron Availability on the Coupling of Photosynthetic Electron Transport and CO2-Assimilation in Marine Phytoplankton. Nina Schuback Christina Schallenberg Carolyn Duckham Maria T Maldonado Philippe D Tortell 2015-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0133235 https://doaj.org/article/08018074b6be4711b5b2d202788f78a2 EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC4501554?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0133235 https://doaj.org/article/08018074b6be4711b5b2d202788f78a2 PLoS ONE, Vol 10, Iss 7, p e0133235 (2015) Medicine R Science Q article 2015 ftdoajarticles https://doi.org/10.1371/journal.pone.0133235 2022-12-31T09:30:58Z Iron availability directly affects photosynthesis and limits phytoplankton growth over vast oceanic regions. For this reason, the availability of iron is a crucial variable to consider in the development of active chlorophyll a fluorescence based estimates of phytoplankton primary productivity. These bio-optical approaches require a conversion factor to derive ecologically-relevant rates of CO2-assimilation from estimates of electron transport in photosystem II. The required conversion factor varies significantly across phytoplankton taxa and environmental conditions, but little information is available on its response to iron limitation. In this study, we examine the role of iron limitation, and the interacting effects of iron and light availability, on the coupling of photosynthetic electron transport and CO2-assimilation in marine phytoplankton. Our results show that excess irradiance causes increased decoupling of carbon fixation and electron transport, particularly under iron limiting conditions. We observed that reaction center II specific rates of electron transport (ETR(RCII), mol e- mol RCII(-1) s(-1)) increased under iron limitation, and we propose a simple conceptual model for this observation. We also observed a strong correlation between the derived conversion factor and the expression of non-photochemical quenching. Utilizing a dataset from in situ phytoplankton assemblages across a coastal--oceanic transect in the Northeast subarctic Pacific, this relationship was used to predict ETR(RCII): CO2-assimilation conversion factors and carbon-based primary productivity from FRRF data, without the need for any additional measurements. Article in Journal/Newspaper Subarctic Directory of Open Access Journals: DOAJ Articles Pacific PLOS ONE 10 7 e0133235 |
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Medicine R Science Q Nina Schuback Christina Schallenberg Carolyn Duckham Maria T Maldonado Philippe D Tortell Interacting Effects of Light and Iron Availability on the Coupling of Photosynthetic Electron Transport and CO2-Assimilation in Marine Phytoplankton. |
topic_facet |
Medicine R Science Q |
description |
Iron availability directly affects photosynthesis and limits phytoplankton growth over vast oceanic regions. For this reason, the availability of iron is a crucial variable to consider in the development of active chlorophyll a fluorescence based estimates of phytoplankton primary productivity. These bio-optical approaches require a conversion factor to derive ecologically-relevant rates of CO2-assimilation from estimates of electron transport in photosystem II. The required conversion factor varies significantly across phytoplankton taxa and environmental conditions, but little information is available on its response to iron limitation. In this study, we examine the role of iron limitation, and the interacting effects of iron and light availability, on the coupling of photosynthetic electron transport and CO2-assimilation in marine phytoplankton. Our results show that excess irradiance causes increased decoupling of carbon fixation and electron transport, particularly under iron limiting conditions. We observed that reaction center II specific rates of electron transport (ETR(RCII), mol e- mol RCII(-1) s(-1)) increased under iron limitation, and we propose a simple conceptual model for this observation. We also observed a strong correlation between the derived conversion factor and the expression of non-photochemical quenching. Utilizing a dataset from in situ phytoplankton assemblages across a coastal--oceanic transect in the Northeast subarctic Pacific, this relationship was used to predict ETR(RCII): CO2-assimilation conversion factors and carbon-based primary productivity from FRRF data, without the need for any additional measurements. |
format |
Article in Journal/Newspaper |
author |
Nina Schuback Christina Schallenberg Carolyn Duckham Maria T Maldonado Philippe D Tortell |
author_facet |
Nina Schuback Christina Schallenberg Carolyn Duckham Maria T Maldonado Philippe D Tortell |
author_sort |
Nina Schuback |
title |
Interacting Effects of Light and Iron Availability on the Coupling of Photosynthetic Electron Transport and CO2-Assimilation in Marine Phytoplankton. |
title_short |
Interacting Effects of Light and Iron Availability on the Coupling of Photosynthetic Electron Transport and CO2-Assimilation in Marine Phytoplankton. |
title_full |
Interacting Effects of Light and Iron Availability on the Coupling of Photosynthetic Electron Transport and CO2-Assimilation in Marine Phytoplankton. |
title_fullStr |
Interacting Effects of Light and Iron Availability on the Coupling of Photosynthetic Electron Transport and CO2-Assimilation in Marine Phytoplankton. |
title_full_unstemmed |
Interacting Effects of Light and Iron Availability on the Coupling of Photosynthetic Electron Transport and CO2-Assimilation in Marine Phytoplankton. |
title_sort |
interacting effects of light and iron availability on the coupling of photosynthetic electron transport and co2-assimilation in marine phytoplankton. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2015 |
url |
https://doi.org/10.1371/journal.pone.0133235 https://doaj.org/article/08018074b6be4711b5b2d202788f78a2 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
PLoS ONE, Vol 10, Iss 7, p e0133235 (2015) |
op_relation |
http://europepmc.org/articles/PMC4501554?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0133235 https://doaj.org/article/08018074b6be4711b5b2d202788f78a2 |
op_doi |
https://doi.org/10.1371/journal.pone.0133235 |
container_title |
PLOS ONE |
container_volume |
10 |
container_issue |
7 |
container_start_page |
e0133235 |
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