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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ftdoajarticles:oai:doaj.org/article:62d0eb80235148d7847251f9b653b90d 2023-05-15T17:50:56+02:00 Photorespiration in eelgrass (Zostera marina L.): A photoprotection mechanism for survival in a CO2-limited world Billur Celebi-Ergin Richard C. Zimmerman Victoria J. Hill 2022-11-01T00:00:00Z https://doi.org/10.3389/fpls.2022.1025416 https://doaj.org/article/62d0eb80235148d7847251f9b653b90d EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fpls.2022.1025416/full https://doaj.org/toc/1664-462X 1664-462X doi:10.3389/fpls.2022.1025416 https://doaj.org/article/62d0eb80235148d7847251f9b653b90d Frontiers in Plant Science, Vol 13 (2022) CO2 non-photochemical quenching ocean acidification photorespiration photosynthesis quantum yield Plant culture SB1-1110 article 2022 ftdoajarticles https://doi.org/10.3389/fpls.2022.1025416 2022-12-30T19:38:51Z 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 role ... Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Frontiers in Plant Science 13 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
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topic |
CO2 non-photochemical quenching ocean acidification photorespiration photosynthesis quantum yield Plant culture SB1-1110 |
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CO2 non-photochemical quenching ocean acidification photorespiration photosynthesis quantum yield Plant culture SB1-1110 Billur Celebi-Ergin Richard C. Zimmerman Victoria J. Hill Photorespiration in eelgrass (Zostera marina L.): A photoprotection mechanism for survival in a CO2-limited world |
topic_facet |
CO2 non-photochemical quenching ocean acidification photorespiration photosynthesis quantum yield Plant culture SB1-1110 |
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 role ... |
format |
Article in Journal/Newspaper |
author |
Billur Celebi-Ergin Richard C. Zimmerman Victoria J. Hill |
author_facet |
Billur Celebi-Ergin Richard C. Zimmerman Victoria J. Hill |
author_sort |
Billur Celebi-Ergin |
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 Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/fpls.2022.1025416 https://doaj.org/article/62d0eb80235148d7847251f9b653b90d |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Frontiers in Plant Science, Vol 13 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fpls.2022.1025416/full https://doaj.org/toc/1664-462X 1664-462X doi:10.3389/fpls.2022.1025416 https://doaj.org/article/62d0eb80235148d7847251f9b653b90d |
op_doi |
https://doi.org/10.3389/fpls.2022.1025416 |
container_title |
Frontiers in Plant Science |
container_volume |
13 |
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1766157883721908224 |