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...
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ftunivkocdc:oai:libdigitalcollections.ku.edu.tr:IR/10976 2024-09-15T18:28:03+00:00 Photorespiration in eelgrass (Zostera marina L.): a photoprotection mechanism for survival in a CO2-limited world Ergin, Billur Çelebi (ORCID 0000-0002-9949-1617 & YÖK ID 261792) Zimmerman, Richard C. C.; Hill, Victoria J. J. College of Sciences Department of Molecular Biology and Genetics 2022 pdf https://doi.org/10.3389/fpls.2022.1025416 http://libdigitalcollections.ku.edu.tr/cdm/ref/collection/IR/id/10976 English eng Frontiers International Publisher version Koç University Institutional Repository IR04091.pdf 1664-462X Billur Celebi-Ergin et al. “Photorespiration in Eelgrass (Zostera Marina L.): A Photoprotection Mechanism for Survival in a Co2-Limited World.”.Frontiers in Plant Science. 2022. https://dx.doi.org/10.3389/fpls.2022.1025416 WoS; Scopus; PubMed NA http://libdigitalcollections.ku.edu.tr/cdm/ref/collection/IR/id/10976 Frontiers in Plant Science Plant sciences CO2 Non-photochemical quenching Ocean acidification Photorespiration Photosynthesis Quantum yield Seagrass Journal article text/academic publication 2022 ftunivkocdc https://doi.org/10.3389/fpls.2022.1025416 2024-07-17T03:48:41Z 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 ?M 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 Koç University Suna Kıraç Library’ Digital Collections Frontiers in Plant Science 13 |
institution |
Open Polar |
collection |
Koç University Suna Kıraç Library’ Digital Collections |
op_collection_id |
ftunivkocdc |
language |
English |
topic |
Plant sciences CO2 Non-photochemical quenching Ocean acidification Photorespiration Photosynthesis Quantum yield Seagrass |
spellingShingle |
Plant sciences CO2 Non-photochemical quenching Ocean acidification Photorespiration Photosynthesis Quantum yield Seagrass Photorespiration in eelgrass (Zostera marina L.): a photoprotection mechanism for survival in a CO2-limited world |
topic_facet |
Plant sciences CO2 Non-photochemical quenching Ocean acidification Photorespiration Photosynthesis Quantum yield Seagrass |
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 ?M 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 ... |
author2 |
Ergin, Billur Çelebi (ORCID 0000-0002-9949-1617 & YÖK ID 261792) Zimmerman, Richard C. C.; Hill, Victoria J. J. College of Sciences Department of Molecular Biology and Genetics |
format |
Article in Journal/Newspaper |
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 |
Frontiers |
publishDate |
2022 |
url |
https://doi.org/10.3389/fpls.2022.1025416 http://libdigitalcollections.ku.edu.tr/cdm/ref/collection/IR/id/10976 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Frontiers in Plant Science |
op_relation |
Publisher version Koç University Institutional Repository IR04091.pdf 1664-462X Billur Celebi-Ergin et al. “Photorespiration in Eelgrass (Zostera Marina L.): A Photoprotection Mechanism for Survival in a Co2-Limited World.”.Frontiers in Plant Science. 2022. https://dx.doi.org/10.3389/fpls.2022.1025416 WoS; Scopus; PubMed NA http://libdigitalcollections.ku.edu.tr/cdm/ref/collection/IR/id/10976 |
op_doi |
https://doi.org/10.3389/fpls.2022.1025416 |
container_title |
Frontiers in Plant Science |
container_volume |
13 |
_version_ |
1810469350522486784 |