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Saturating light and not increased carbon dioxide under ocean acidification drives photosynthesis and growth in Ulva rigida (Chlorophyta)
Carbon physiology of a genetically identified Ulva rigida was investigated under different CO(2(aq)) and light levels. The study was designed to answer whether (1) light or exogenous inorganic carbon (Ci) pool is driving growth; and (2) elevated CO(2(aq)) concentration under ocean acidification (OA)...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BlackWell Publishing Ltd
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4338970/ https://www.ncbi.nlm.nih.gov/pubmed/25750714 http://dx.doi.org/10.1002/ece3.1382 |
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author | Rautenberger, Ralf Fernández, Pamela A Strittmatter, Martina Heesch, Svenja Cornwall, Christopher E Hurd, Catriona L Roleda, Michael Y |
author_facet | Rautenberger, Ralf Fernández, Pamela A Strittmatter, Martina Heesch, Svenja Cornwall, Christopher E Hurd, Catriona L Roleda, Michael Y |
author_sort | Rautenberger, Ralf |
collection | PubMed |
description | Carbon physiology of a genetically identified Ulva rigida was investigated under different CO(2(aq)) and light levels. The study was designed to answer whether (1) light or exogenous inorganic carbon (Ci) pool is driving growth; and (2) elevated CO(2(aq)) concentration under ocean acidification (OA) will downregulate CA(ext)-mediated [Image: see text] dehydration and alter the stable carbon isotope (δ(13)C) signatures toward more CO(2) use to support higher growth rate. At pH(T) 9.0 where CO(2(aq)) is <1 μmol L(−1), inhibition of the known [Image: see text] use mechanisms, that is, direct [Image: see text] uptake through the AE port and CA(ext)-mediated [Image: see text] dehydration decreased net photosynthesis (NPS) by only 56–83%, leaving the carbon uptake mechanism for the remaining 17–44% of the NPS unaccounted. An in silico search for carbon-concentrating mechanism elements in expressed sequence tag libraries of Ulva found putative light-dependent [Image: see text] transporters to which the remaining NPS can be attributed. The shift in δ(13)C signatures from –22‰ toward –10‰ under saturating light but not under elevated CO(2(aq)) suggest preference and substantial [Image: see text] use to support photosynthesis and growth. U. rigida is Ci saturated, and growth was primarily controlled by light. Therefore, increased levels of CO(2(aq)) predicted for the future will not, in isolation, stimulate Ulva blooms. |
format | Online Article Text |
id | pubmed-4338970 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | BlackWell Publishing Ltd |
record_format | MEDLINE/PubMed |
spelling | pubmed-43389702015-03-06 Saturating light and not increased carbon dioxide under ocean acidification drives photosynthesis and growth in Ulva rigida (Chlorophyta) Rautenberger, Ralf Fernández, Pamela A Strittmatter, Martina Heesch, Svenja Cornwall, Christopher E Hurd, Catriona L Roleda, Michael Y Ecol Evol Original Research Carbon physiology of a genetically identified Ulva rigida was investigated under different CO(2(aq)) and light levels. The study was designed to answer whether (1) light or exogenous inorganic carbon (Ci) pool is driving growth; and (2) elevated CO(2(aq)) concentration under ocean acidification (OA) will downregulate CA(ext)-mediated [Image: see text] dehydration and alter the stable carbon isotope (δ(13)C) signatures toward more CO(2) use to support higher growth rate. At pH(T) 9.0 where CO(2(aq)) is <1 μmol L(−1), inhibition of the known [Image: see text] use mechanisms, that is, direct [Image: see text] uptake through the AE port and CA(ext)-mediated [Image: see text] dehydration decreased net photosynthesis (NPS) by only 56–83%, leaving the carbon uptake mechanism for the remaining 17–44% of the NPS unaccounted. An in silico search for carbon-concentrating mechanism elements in expressed sequence tag libraries of Ulva found putative light-dependent [Image: see text] transporters to which the remaining NPS can be attributed. The shift in δ(13)C signatures from –22‰ toward –10‰ under saturating light but not under elevated CO(2(aq)) suggest preference and substantial [Image: see text] use to support photosynthesis and growth. U. rigida is Ci saturated, and growth was primarily controlled by light. Therefore, increased levels of CO(2(aq)) predicted for the future will not, in isolation, stimulate Ulva blooms. BlackWell Publishing Ltd 2015-02 2015-01-25 /pmc/articles/PMC4338970/ /pubmed/25750714 http://dx.doi.org/10.1002/ece3.1382 Text en © 2015 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. http://creativecommons.org/licenses/by/4.0/ This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Research Rautenberger, Ralf Fernández, Pamela A Strittmatter, Martina Heesch, Svenja Cornwall, Christopher E Hurd, Catriona L Roleda, Michael Y Saturating light and not increased carbon dioxide under ocean acidification drives photosynthesis and growth in Ulva rigida (Chlorophyta) |
title | Saturating light and not increased carbon dioxide under ocean acidification drives photosynthesis and growth in Ulva rigida (Chlorophyta) |
title_full | Saturating light and not increased carbon dioxide under ocean acidification drives photosynthesis and growth in Ulva rigida (Chlorophyta) |
title_fullStr | Saturating light and not increased carbon dioxide under ocean acidification drives photosynthesis and growth in Ulva rigida (Chlorophyta) |
title_full_unstemmed | Saturating light and not increased carbon dioxide under ocean acidification drives photosynthesis and growth in Ulva rigida (Chlorophyta) |
title_short | Saturating light and not increased carbon dioxide under ocean acidification drives photosynthesis and growth in Ulva rigida (Chlorophyta) |
title_sort | saturating light and not increased carbon dioxide under ocean acidification drives photosynthesis and growth in ulva rigida (chlorophyta) |
topic | Original Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4338970/ https://www.ncbi.nlm.nih.gov/pubmed/25750714 http://dx.doi.org/10.1002/ece3.1382 |
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