Photorespiration in Eelgrass ( Zostera marina L.): A Photoprotection Mechanism for Survival in a CO₂-Limited World
Photorespiration, commonly viewed as a loss in photosynthetic productivity of C3 plants, is expected to decline with increasing atmospheric CO2, even though photorespiration plays an important role in the oxidative stress responses. This study aimed to quantify the role of photorespiration and alter...
Published in: | Frontiers in Plant Science |
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ODU Digital Commons
2022
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Online Access: | https://digitalcommons.odu.edu/oeas_fac_pubs/470 https://doi.org/10.3389/fpls.2022.1025416 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1481/viewcontent/Hill_2022_PhotorespirationinEelgrassZosteraMarinaOCR.pdf |
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ftolddominionuni:oai:digitalcommons.odu.edu:oeas_fac_pubs-1481 2023-06-11T04:15:38+02:00 Photorespiration in Eelgrass ( Zostera marina L.): A Photoprotection Mechanism for Survival in a CO₂-Limited World Celebi-Ergin, Billur Zimmerman, Richard C. Hill, Victoria J. 2022-01-01T08:00:00Z application/pdf https://digitalcommons.odu.edu/oeas_fac_pubs/470 https://doi.org/10.3389/fpls.2022.1025416 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1481/viewcontent/Hill_2022_PhotorespirationinEelgrassZosteraMarinaOCR.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/oeas_fac_pubs/470 doi:10.3389/fpls.2022.1025416 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1481/viewcontent/Hill_2022_PhotorespirationinEelgrassZosteraMarinaOCR.pdf © 2022 Celebi-Ergin, Zimmerman, and Hill. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0) . The use, distribution or reproduction in other forums is permitted, provided the original authors and the copyright owners are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. OES Faculty Publications CO2 CO₂ Non-photochemical quenching Ocean acidification Photorespiration Photosynthesis Quantum yield Seagrass Climate Marine Biology Oceanography Plant Sciences article 2022 ftolddominionuni https://doi.org/10.3389/fpls.2022.1025416 2023-05-08T18:01:05Z Photorespiration, commonly viewed as a loss in photosynthetic productivity of C3 plants, is expected to decline with increasing atmospheric CO2, even though photorespiration plays an important role in the oxidative stress responses. This study aimed to quantify the role of photorespiration and alternative photoprotection mechanisms in Zostera marina L. (eelgrass), a carbon-limited marine C3 plant, in response to ocean acidification. Plants were grown in controlled outdoor aquaria at different [CO2]aq ranging from ~55 (ambient) to ~2121 μM for 13 months and compared for differences in leaf photochemistry by simultaneous measurements of O2 flux and variable fluorescence. At ambient [CO2], photosynthesis was carbon limited and the excess photon absorption was diverted both to photorespiration and non-photochemical quenching (NPQ). The dynamic range of NPQ regulation in ambient grown plants, in response to instantaneous changes in [CO2]aq, suggested considerable tolerance for fluctuating environmental conditions. However, 60 to 80% of maximum photosynthetic capacity of ambient plants was diverted to photorespiration resulting in limited carbon fixation. The photosynthesis to respiration ratio (PE : RD) of ambient grown plants increased 6-fold when measured under high CO2 because photorespiration was virtually suppressed. Plants acclimated to high CO2 maintained 4-fold higher PE : RD than ambient grown plants as a result of a 60% reduction in photorespiration. The O2 production efficiency per unit chlorophyll was not affected by the CO2 environment in which the plants were grown. Yet, CO2 enrichment decreased the light level to initiate NPQ activity and downregulated the biomass specific pigment content by 50% and area specific pigment content by 30%. Thus, phenotypic acclimation to ocean carbonation in eelgrass, indicating the coupling between the regulation of photosynthetic structure and metabolic carbon demands, involved the downregulation of light harvesting by the photosynthetic apparatus, a reduction in the ... Article in Journal/Newspaper Ocean acidification Old Dominion University: ODU Digital Commons Frontiers in Plant Science 13 |
institution |
Open Polar |
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Old Dominion University: ODU Digital Commons |
op_collection_id |
ftolddominionuni |
language |
unknown |
topic |
CO2 CO₂ Non-photochemical quenching Ocean acidification Photorespiration Photosynthesis Quantum yield Seagrass Climate Marine Biology Oceanography Plant Sciences |
spellingShingle |
CO2 CO₂ Non-photochemical quenching Ocean acidification Photorespiration Photosynthesis Quantum yield Seagrass Climate Marine Biology Oceanography Plant Sciences Celebi-Ergin, Billur Zimmerman, Richard C. Hill, Victoria J. Photorespiration in Eelgrass ( Zostera marina L.): A Photoprotection Mechanism for Survival in a CO₂-Limited World |
topic_facet |
CO2 CO₂ Non-photochemical quenching Ocean acidification Photorespiration Photosynthesis Quantum yield Seagrass Climate Marine Biology Oceanography Plant Sciences |
description |
Photorespiration, commonly viewed as a loss in photosynthetic productivity of C3 plants, is expected to decline with increasing atmospheric CO2, even though photorespiration plays an important role in the oxidative stress responses. This study aimed to quantify the role of photorespiration and alternative photoprotection mechanisms in Zostera marina L. (eelgrass), a carbon-limited marine C3 plant, in response to ocean acidification. Plants were grown in controlled outdoor aquaria at different [CO2]aq ranging from ~55 (ambient) to ~2121 μM for 13 months and compared for differences in leaf photochemistry by simultaneous measurements of O2 flux and variable fluorescence. At ambient [CO2], photosynthesis was carbon limited and the excess photon absorption was diverted both to photorespiration and non-photochemical quenching (NPQ). The dynamic range of NPQ regulation in ambient grown plants, in response to instantaneous changes in [CO2]aq, suggested considerable tolerance for fluctuating environmental conditions. However, 60 to 80% of maximum photosynthetic capacity of ambient plants was diverted to photorespiration resulting in limited carbon fixation. The photosynthesis to respiration ratio (PE : RD) of ambient grown plants increased 6-fold when measured under high CO2 because photorespiration was virtually suppressed. Plants acclimated to high CO2 maintained 4-fold higher PE : RD than ambient grown plants as a result of a 60% reduction in photorespiration. The O2 production efficiency per unit chlorophyll was not affected by the CO2 environment in which the plants were grown. Yet, CO2 enrichment decreased the light level to initiate NPQ activity and downregulated the biomass specific pigment content by 50% and area specific pigment content by 30%. Thus, phenotypic acclimation to ocean carbonation in eelgrass, indicating the coupling between the regulation of photosynthetic structure and metabolic carbon demands, involved the downregulation of light harvesting by the photosynthetic apparatus, a reduction in the ... |
format |
Article in Journal/Newspaper |
author |
Celebi-Ergin, Billur Zimmerman, Richard C. Hill, Victoria J. |
author_facet |
Celebi-Ergin, Billur Zimmerman, Richard C. Hill, Victoria J. |
author_sort |
Celebi-Ergin, Billur |
title |
Photorespiration in Eelgrass ( Zostera marina L.): A Photoprotection Mechanism for Survival in a CO₂-Limited World |
title_short |
Photorespiration in Eelgrass ( Zostera marina L.): A Photoprotection Mechanism for Survival in a CO₂-Limited World |
title_full |
Photorespiration in Eelgrass ( Zostera marina L.): A Photoprotection Mechanism for Survival in a CO₂-Limited World |
title_fullStr |
Photorespiration in Eelgrass ( Zostera marina L.): A Photoprotection Mechanism for Survival in a CO₂-Limited World |
title_full_unstemmed |
Photorespiration in Eelgrass ( Zostera marina L.): A Photoprotection Mechanism for Survival in a CO₂-Limited World |
title_sort |
photorespiration in eelgrass ( zostera marina l.): a photoprotection mechanism for survival in a co₂-limited world |
publisher |
ODU Digital Commons |
publishDate |
2022 |
url |
https://digitalcommons.odu.edu/oeas_fac_pubs/470 https://doi.org/10.3389/fpls.2022.1025416 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1481/viewcontent/Hill_2022_PhotorespirationinEelgrassZosteraMarinaOCR.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
OES Faculty Publications |
op_relation |
https://digitalcommons.odu.edu/oeas_fac_pubs/470 doi:10.3389/fpls.2022.1025416 https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1481/viewcontent/Hill_2022_PhotorespirationinEelgrassZosteraMarinaOCR.pdf |
op_rights |
© 2022 Celebi-Ergin, Zimmerman, and Hill. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0) . The use, distribution or reproduction in other forums is permitted, provided the original authors and the copyright owners are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
op_doi |
https://doi.org/10.3389/fpls.2022.1025416 |
container_title |
Frontiers in Plant Science |
container_volume |
13 |
_version_ |
1768372613099290624 |