Growth, ammonium metabolism, and photosynthetic properties of Ulva australis (Chlorophyta) under decreasing pH and ammonium enrichment
The responses of macroalgae to ocean acidification could be altered by availability of macronutrients, such as ammonium (NH 4 + ). This study determined how the opportunistic macroalga, Ulva australis responded to simultaneous changes in decreasing pH and NH 4 + enrichment. This was investigated in...
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ftunivtasecite:oai:ecite.utas.edu.au:122793 2023-05-15T17:51:58+02:00 Growth, ammonium metabolism, and photosynthetic properties of Ulva australis (Chlorophyta) under decreasing pH and ammonium enrichment Reidenbach, LB Fernandez, P Leal, PP Noisette, F McGraw, CM Revill, AT Hurd, CL Kubler, JE 2017 application/pdf https://doi.org/10.1371/journal.pone.0188389 http://www.ncbi.nlm.nih.gov/pubmed/29176815 http://ecite.utas.edu.au/122793 en eng Public Library of Science http://ecite.utas.edu.au/122793/1/Reidenbach et al 2017.pdf http://dx.doi.org/10.1371/journal.pone.0188389 Reidenbach, LB and Fernandez, P and Leal, PP and Noisette, F and McGraw, CM and Revill, AT and Hurd, CL and Kubler, JE, Growth, ammonium metabolism, and photosynthetic properties of Ulva australis (Chlorophyta) under decreasing pH and ammonium enrichment, PLoS One, 12, (11) Article e0188389. ISSN 1932-6203 (2017) [Refereed Article] http://www.ncbi.nlm.nih.gov/pubmed/29176815 http://ecite.utas.edu.au/122793 Biological Sciences Plant Biology Phycology (incl. Marine Grasses) Refereed Article PeerReviewed 2017 ftunivtasecite https://doi.org/10.1371/journal.pone.0188389 2019-12-13T22:21:37Z The responses of macroalgae to ocean acidification could be altered by availability of macronutrients, such as ammonium (NH 4 + ). This study determined how the opportunistic macroalga, Ulva australis responded to simultaneous changes in decreasing pH and NH 4 + enrichment. This was investigated in a week-long growth experiment across a range of predicted future pHs with ambient and enriched NH 4 + treatments followed by measurements of relative growth rates (RGR), NH 4 + uptake rates and pools, total chlorophyll, and tissue carbon and nitrogen content. Rapid light curves (RLCs) were used to measure the maximum relative electron transport rate (rETR max ) and maximum quantum yield of photosystem II (PSII) photochemistry (F v /F m ). Photosynthetic capacity was derived from the RLCs and included the efficiency of light harvesting (α), slope of photoinhibition (β), and the light saturation point (E k ). The results showed that NH 4 + enrichment did not modify the effects of pH on RGRs, NH 4 + uptake rates and pools, total chlorophyll, rETR max , α, β, F v /F m , tissue C and N, and the C:N ratio. However, E k was differentially affected by pH under different NH 4 + treatments. E k increased with decreasing pH in the ambient NH 4 + treatment, but not in the enriched NH 4 + treatment. NH 4 + enrichment increased RGRs, NH 4 + pools, total chlorophyll, rETR max , α, β, F v /F m , and tissue N, and decreased NH 4 + uptake rates and the C:N ratio. Decreased pH increased total chlorophyll content, rETR max , F v /F m , and tissue N content, and decreased the C:N ratio. Therefore, the results indicate that U . australis growth is increased with NH 4 + enrichment and not with decreasing pH. While decreasing pH influenced the carbon and nitrogen metabolisms of U . australis , it did not result in changes in growth. Article in Journal/Newspaper Ocean acidification eCite UTAS (University of Tasmania) PLOS ONE 12 11 e0188389 |
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Open Polar |
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eCite UTAS (University of Tasmania) |
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ftunivtasecite |
language |
English |
topic |
Biological Sciences Plant Biology Phycology (incl. Marine Grasses) |
spellingShingle |
Biological Sciences Plant Biology Phycology (incl. Marine Grasses) Reidenbach, LB Fernandez, P Leal, PP Noisette, F McGraw, CM Revill, AT Hurd, CL Kubler, JE Growth, ammonium metabolism, and photosynthetic properties of Ulva australis (Chlorophyta) under decreasing pH and ammonium enrichment |
topic_facet |
Biological Sciences Plant Biology Phycology (incl. Marine Grasses) |
description |
The responses of macroalgae to ocean acidification could be altered by availability of macronutrients, such as ammonium (NH 4 + ). This study determined how the opportunistic macroalga, Ulva australis responded to simultaneous changes in decreasing pH and NH 4 + enrichment. This was investigated in a week-long growth experiment across a range of predicted future pHs with ambient and enriched NH 4 + treatments followed by measurements of relative growth rates (RGR), NH 4 + uptake rates and pools, total chlorophyll, and tissue carbon and nitrogen content. Rapid light curves (RLCs) were used to measure the maximum relative electron transport rate (rETR max ) and maximum quantum yield of photosystem II (PSII) photochemistry (F v /F m ). Photosynthetic capacity was derived from the RLCs and included the efficiency of light harvesting (α), slope of photoinhibition (β), and the light saturation point (E k ). The results showed that NH 4 + enrichment did not modify the effects of pH on RGRs, NH 4 + uptake rates and pools, total chlorophyll, rETR max , α, β, F v /F m , tissue C and N, and the C:N ratio. However, E k was differentially affected by pH under different NH 4 + treatments. E k increased with decreasing pH in the ambient NH 4 + treatment, but not in the enriched NH 4 + treatment. NH 4 + enrichment increased RGRs, NH 4 + pools, total chlorophyll, rETR max , α, β, F v /F m , and tissue N, and decreased NH 4 + uptake rates and the C:N ratio. Decreased pH increased total chlorophyll content, rETR max , F v /F m , and tissue N content, and decreased the C:N ratio. Therefore, the results indicate that U . australis growth is increased with NH 4 + enrichment and not with decreasing pH. While decreasing pH influenced the carbon and nitrogen metabolisms of U . australis , it did not result in changes in growth. |
format |
Article in Journal/Newspaper |
author |
Reidenbach, LB Fernandez, P Leal, PP Noisette, F McGraw, CM Revill, AT Hurd, CL Kubler, JE |
author_facet |
Reidenbach, LB Fernandez, P Leal, PP Noisette, F McGraw, CM Revill, AT Hurd, CL Kubler, JE |
author_sort |
Reidenbach, LB |
title |
Growth, ammonium metabolism, and photosynthetic properties of Ulva australis (Chlorophyta) under decreasing pH and ammonium enrichment |
title_short |
Growth, ammonium metabolism, and photosynthetic properties of Ulva australis (Chlorophyta) under decreasing pH and ammonium enrichment |
title_full |
Growth, ammonium metabolism, and photosynthetic properties of Ulva australis (Chlorophyta) under decreasing pH and ammonium enrichment |
title_fullStr |
Growth, ammonium metabolism, and photosynthetic properties of Ulva australis (Chlorophyta) under decreasing pH and ammonium enrichment |
title_full_unstemmed |
Growth, ammonium metabolism, and photosynthetic properties of Ulva australis (Chlorophyta) under decreasing pH and ammonium enrichment |
title_sort |
growth, ammonium metabolism, and photosynthetic properties of ulva australis (chlorophyta) under decreasing ph and ammonium enrichment |
publisher |
Public Library of Science |
publishDate |
2017 |
url |
https://doi.org/10.1371/journal.pone.0188389 http://www.ncbi.nlm.nih.gov/pubmed/29176815 http://ecite.utas.edu.au/122793 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
http://ecite.utas.edu.au/122793/1/Reidenbach et al 2017.pdf http://dx.doi.org/10.1371/journal.pone.0188389 Reidenbach, LB and Fernandez, P and Leal, PP and Noisette, F and McGraw, CM and Revill, AT and Hurd, CL and Kubler, JE, Growth, ammonium metabolism, and photosynthetic properties of Ulva australis (Chlorophyta) under decreasing pH and ammonium enrichment, PLoS One, 12, (11) Article e0188389. ISSN 1932-6203 (2017) [Refereed Article] http://www.ncbi.nlm.nih.gov/pubmed/29176815 http://ecite.utas.edu.au/122793 |
op_doi |
https://doi.org/10.1371/journal.pone.0188389 |
container_title |
PLOS ONE |
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12 |
container_issue |
11 |
container_start_page |
e0188389 |
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