Interacting effects of light and iron availability on the coupling of photosynthetic electron transport and CO 2 -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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ftunivtasecite:oai:ecite.utas.edu.au:108992 2023-05-15T18:28:32+02:00 Interacting effects of light and iron availability on the coupling of photosynthetic electron transport and CO 2 -assimilation in marine phytoplankton Schuback, N Schallenberg, C Duckham, C Maldonado, MT Tortell, PD 2015 application/pdf https://doi.org/10.1371/journal.pone.0133235 http://www.ncbi.nlm.nih.gov/pubmed/26171963 http://ecite.utas.edu.au/108992 en eng Public Library of Science http://ecite.utas.edu.au/108992/1/Schuback et al 2015.PDF http://dx.doi.org/10.1371/journal.pone.0133235 Schuback, N and Schallenberg, C and Duckham, C and Maldonado, MT and Tortell, PD, Interacting effects of light and iron availability on the coupling of photosynthetic electron transport and CO 2 -assimilation in marine phytoplankton, PLoS ONE, 10, (7) Article e0133235. ISSN 1932-6203 (2015) [Refereed Article] http://www.ncbi.nlm.nih.gov/pubmed/26171963 http://ecite.utas.edu.au/108992 Earth Sciences Oceanography Biological Oceanography Refereed Article PeerReviewed 2015 ftunivtasecite https://doi.org/10.1371/journal.pone.0133235 2019-12-13T22:09:41Z 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 CO 2 -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 CO 2 -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 : CO 2 -assimilation conversion factors and carbon-based primary productivity from FRRF data, without the need for any additional measurements. Article in Journal/Newspaper Subarctic eCite UTAS (University of Tasmania) Pacific PLOS ONE 10 7 e0133235 |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Earth Sciences Oceanography Biological Oceanography |
spellingShingle |
Earth Sciences Oceanography Biological Oceanography Schuback, N Schallenberg, C Duckham, C Maldonado, MT Tortell, PD Interacting effects of light and iron availability on the coupling of photosynthetic electron transport and CO 2 -assimilation in marine phytoplankton |
topic_facet |
Earth Sciences Oceanography Biological Oceanography |
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 CO 2 -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 CO 2 -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 : CO 2 -assimilation conversion factors and carbon-based primary productivity from FRRF data, without the need for any additional measurements. |
format |
Article in Journal/Newspaper |
author |
Schuback, N Schallenberg, C Duckham, C Maldonado, MT Tortell, PD |
author_facet |
Schuback, N Schallenberg, C Duckham, C Maldonado, MT Tortell, PD |
author_sort |
Schuback, N |
title |
Interacting effects of light and iron availability on the coupling of photosynthetic electron transport and CO 2 -assimilation in marine phytoplankton |
title_short |
Interacting effects of light and iron availability on the coupling of photosynthetic electron transport and CO 2 -assimilation in marine phytoplankton |
title_full |
Interacting effects of light and iron availability on the coupling of photosynthetic electron transport and CO 2 -assimilation in marine phytoplankton |
title_fullStr |
Interacting effects of light and iron availability on the coupling of photosynthetic electron transport and CO 2 -assimilation in marine phytoplankton |
title_full_unstemmed |
Interacting effects of light and iron availability on the coupling of photosynthetic electron transport and CO 2 -assimilation in marine phytoplankton |
title_sort |
interacting effects of light and iron availability on the coupling of photosynthetic electron transport and co 2 -assimilation in marine phytoplankton |
publisher |
Public Library of Science |
publishDate |
2015 |
url |
https://doi.org/10.1371/journal.pone.0133235 http://www.ncbi.nlm.nih.gov/pubmed/26171963 http://ecite.utas.edu.au/108992 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Subarctic |
genre_facet |
Subarctic |
op_relation |
http://ecite.utas.edu.au/108992/1/Schuback et al 2015.PDF http://dx.doi.org/10.1371/journal.pone.0133235 Schuback, N and Schallenberg, C and Duckham, C and Maldonado, MT and Tortell, PD, Interacting effects of light and iron availability on the coupling of photosynthetic electron transport and CO 2 -assimilation in marine phytoplankton, PLoS ONE, 10, (7) Article e0133235. ISSN 1932-6203 (2015) [Refereed Article] http://www.ncbi.nlm.nih.gov/pubmed/26171963 http://ecite.utas.edu.au/108992 |
op_doi |
https://doi.org/10.1371/journal.pone.0133235 |
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PLOS ONE |
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10 |
container_issue |
7 |
container_start_page |
e0133235 |
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