Potential Impacts of Climate Change on Photochemistry of Zostera Marina L.
Seagrasses account for approximately 10% of the ocean’s total carbon storage, although photosynthesis of seagrasses is carbon limited at today’s oceanic pH. Therefore, increasing atmospheric CO2 concentration, which results in ocean acidification/carbonation, is predicted to have a positive impact o...
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ftolddominionuni:oai:digitalcommons.odu.edu:oeas_etds-1003 2023-06-11T04:15:34+02:00 Potential Impacts of Climate Change on Photochemistry of Zostera Marina L. Celebi, Billur 2016-10-01T07:00:00Z application/pdf https://digitalcommons.odu.edu/oeas_etds/3 https://doi.org/10.25777/8b9x-8303 https://digitalcommons.odu.edu/context/oeas_etds/article/1003/viewcontent/Celebi_potential.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/oeas_etds/3 doi:10.25777/8b9x-8303 https://digitalcommons.odu.edu/context/oeas_etds/article/1003/viewcontent/Celebi_potential.pdf In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). OES Theses and Dissertations Ocean acidification Photo-protection Photorespiration Photosynthesis Seagrass Zostera marina Climate Oceanography Plant Sciences text 2016 ftolddominionuni https://doi.org/10.25777/8b9x-8303 2023-05-08T17:59:46Z Seagrasses account for approximately 10% of the ocean’s total carbon storage, although photosynthesis of seagrasses is carbon limited at today’s oceanic pH. Therefore, increasing atmospheric CO2 concentration, which results in ocean acidification/carbonation, is predicted to have a positive impact on seagrass productivity. Previous studies have confirmed the positive influence of increasing CO2 on photosynthesis and survival of the temperate eelgrass Zostera marina L., but the acclimation of photoprotective mechanisms in this context has not been characterized. This study aimed to quantify the long-term impacts of ocean acidification on photochemical control mechanisms that promote photosynthesis while simultaneously protecting eelgrass from photodamage. Eelgrass were grown in controlled outdoor aquarium tanks at different aqueous CO2 concentrations ranging from ~50 to ~2100 μM from May 2013 to October 2014, and compared for differences in optical properties and photochemistry. Even with daily and seasonal variations of temperature and light, CO2 enrichment consistently increased plant size, leaf thickness and chlorophyll use efficiency, and decreased pigment content and the package effect while maintaining similar light harvesting efficiency. These CO2 responses resembled high light acclimation suggesting a common photosynthetic sensory function, such as redox regulation, controls long-term acclimation of leaf morphology. Laboratory incubations resolved this mutual regulation of redox state via carbon and light availability, by measuring O2 production, total CO2 uptake and fluorescence of the acclimated leaves. The morphological acclimations due to CO2 enrichment were facilitated by improved photosynthetic capacity. Increasing CO2 availability, relative to oxygen concentrations, maximized chlorophyll specific photosynthesis to its physiological limits at pH 6.2 by minimizing photorespiration, and increased the light requirement to saturate photosynthesis. The instantaneous increase of photosynthesis up to 8 ... Text Ocean acidification Old Dominion University: ODU Digital Commons |
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Old Dominion University: ODU Digital Commons |
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topic |
Ocean acidification Photo-protection Photorespiration Photosynthesis Seagrass Zostera marina Climate Oceanography Plant Sciences |
spellingShingle |
Ocean acidification Photo-protection Photorespiration Photosynthesis Seagrass Zostera marina Climate Oceanography Plant Sciences Celebi, Billur Potential Impacts of Climate Change on Photochemistry of Zostera Marina L. |
topic_facet |
Ocean acidification Photo-protection Photorespiration Photosynthesis Seagrass Zostera marina Climate Oceanography Plant Sciences |
description |
Seagrasses account for approximately 10% of the ocean’s total carbon storage, although photosynthesis of seagrasses is carbon limited at today’s oceanic pH. Therefore, increasing atmospheric CO2 concentration, which results in ocean acidification/carbonation, is predicted to have a positive impact on seagrass productivity. Previous studies have confirmed the positive influence of increasing CO2 on photosynthesis and survival of the temperate eelgrass Zostera marina L., but the acclimation of photoprotective mechanisms in this context has not been characterized. This study aimed to quantify the long-term impacts of ocean acidification on photochemical control mechanisms that promote photosynthesis while simultaneously protecting eelgrass from photodamage. Eelgrass were grown in controlled outdoor aquarium tanks at different aqueous CO2 concentrations ranging from ~50 to ~2100 μM from May 2013 to October 2014, and compared for differences in optical properties and photochemistry. Even with daily and seasonal variations of temperature and light, CO2 enrichment consistently increased plant size, leaf thickness and chlorophyll use efficiency, and decreased pigment content and the package effect while maintaining similar light harvesting efficiency. These CO2 responses resembled high light acclimation suggesting a common photosynthetic sensory function, such as redox regulation, controls long-term acclimation of leaf morphology. Laboratory incubations resolved this mutual regulation of redox state via carbon and light availability, by measuring O2 production, total CO2 uptake and fluorescence of the acclimated leaves. The morphological acclimations due to CO2 enrichment were facilitated by improved photosynthetic capacity. Increasing CO2 availability, relative to oxygen concentrations, maximized chlorophyll specific photosynthesis to its physiological limits at pH 6.2 by minimizing photorespiration, and increased the light requirement to saturate photosynthesis. The instantaneous increase of photosynthesis up to 8 ... |
format |
Text |
author |
Celebi, Billur |
author_facet |
Celebi, Billur |
author_sort |
Celebi, Billur |
title |
Potential Impacts of Climate Change on Photochemistry of Zostera Marina L. |
title_short |
Potential Impacts of Climate Change on Photochemistry of Zostera Marina L. |
title_full |
Potential Impacts of Climate Change on Photochemistry of Zostera Marina L. |
title_fullStr |
Potential Impacts of Climate Change on Photochemistry of Zostera Marina L. |
title_full_unstemmed |
Potential Impacts of Climate Change on Photochemistry of Zostera Marina L. |
title_sort |
potential impacts of climate change on photochemistry of zostera marina l. |
publisher |
ODU Digital Commons |
publishDate |
2016 |
url |
https://digitalcommons.odu.edu/oeas_etds/3 https://doi.org/10.25777/8b9x-8303 https://digitalcommons.odu.edu/context/oeas_etds/article/1003/viewcontent/Celebi_potential.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
OES Theses and Dissertations |
op_relation |
https://digitalcommons.odu.edu/oeas_etds/3 doi:10.25777/8b9x-8303 https://digitalcommons.odu.edu/context/oeas_etds/article/1003/viewcontent/Celebi_potential.pdf |
op_rights |
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). |
op_doi |
https://doi.org/10.25777/8b9x-8303 |
_version_ |
1768372497499029504 |