CO2 and O2 dynamics in leaves of aquatic plants with C3 or CAM photosynthesis – application of a novel CO2 microsensor
Abstract Background and Aims Leaf tissue CO2 partial pressure (pCO2) shows contrasting dynamics over a diurnal cycle in C3 and Crassulacean Acid Metabolism (CAM) plants. However, simultaneous and continuous monitoring of pCO2 and pO2 in C3 and CAM plants under the same conditions was lacking. Our ai...
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Published in | Annals of botany Vol. 122; no. 4; pp. 605 - 615 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
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Oxford University Press
24.09.2018
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Abstract | Abstract
Background and Aims
Leaf tissue CO2 partial pressure (pCO2) shows contrasting dynamics over a diurnal cycle in C3 and Crassulacean Acid Metabolism (CAM) plants. However, simultaneous and continuous monitoring of pCO2 and pO2 in C3 and CAM plants under the same conditions was lacking. Our aim was to use a new CO2 microsensor and an existing O2 microsensor for non-destructive measurements of leaf pCO2 and pO2 dynamics to compare a C3 and a CAM plant in an aquatic environment.
Methods
A new amperometric CO2 microsensor and an O2 microsensor elucidated with high temporal resolution the dynamics in leaf pCO2 and pO2 during light–dark cycles for C3Lobelia dortmanna and CAM Littorella uniflora aquatic plants. Underwater photosynthesis, dark respiration, tissue malate concentrations and sediment CO2 and O2 were also measured.
Key Results
During the dark period, for the C3 plant, pCO2 increased to approx. 3.5 kPa, whereas for the CAM plant CO2 was mostly below 0.05 kPa owing to CO2 sequestration into malate. Upon darkness, the CAM plant had an initial peak in pCO2 (approx. 0.16 kPa) which then declined to a quasi-steady state for several hours and then pCO2 increased towards the end of the dark period. The C3 plant became severely hypoxic late in the dark period, whereas the CAM plant with greater cuticle permeability did not. Upon illumination, leaf pCO2 declined and pO2 increased, although aspects of these dynamics also differed between the two plants.
Conclusions
The continuous measurements of pCO2 and pO2 highlighted the contrasting tissue gas compositions in submerged C3 and CAM plants. The CAM leaf pCO2 dynamics indicate an initial lag in CO2 sequestration to malate, which after several hours of malate synthesis then slows. Like the use of O2 microsensors to resolve questions related to plant aeration, deployment of the new CO2 microsensor will benefit plant ecophysiology research. |
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AbstractList | Leaf tissue CO2 partial pressure (pCO2) shows contrasting dynamics over a diurnal cycle in C3 and Crassulacean Acid Metabolism (CAM) plants. However, simultaneous and continuous monitoring of pCO2 and pO2 in C3 and CAM plants under the same conditions was lacking. Our aim was to use a new CO2 microsensor and an existing O2 microsensor for non-destructive measurements of leaf pCO2 and pO2 dynamics to compare a C3 and a CAM plant in an aquatic environment.
A new amperometric CO2 microsensor and an O2 microsensor elucidated with high temporal resolution the dynamics in leaf pCO2 and pO2 during light-dark cycles for C3Lobelia dortmanna and CAM Littorella uniflora aquatic plants. Underwater photosynthesis, dark respiration, tissue malate concentrations and sediment CO2 and O2 were also measured.
During the dark period, for the C3 plant, pCO2 increased to approx. 3.5 kPa, whereas for the CAM plant CO2 was mostly below 0.05 kPa owing to CO2 sequestration into malate. Upon darkness, the CAM plant had an initial peak in pCO2 (approx. 0.16 kPa) which then declined to a quasi-steady state for several hours and then pCO2 increased towards the end of the dark period. The C3 plant became severely hypoxic late in the dark period, whereas the CAM plant with greater cuticle permeability did not. Upon illumination, leaf pCO2 declined and pO2 increased, although aspects of these dynamics also differed between the two plants.
The continuous measurements of pCO2 and pO2 highlighted the contrasting tissue gas compositions in submerged C3 and CAM plants. The CAM leaf pCO2 dynamics indicate an initial lag in CO2 sequestration to malate, which after several hours of malate synthesis then slows. Like the use of O2 microsensors to resolve questions related to plant aeration, deployment of the new CO2 microsensor will benefit plant ecophysiology research. Abstract Background and Aims Leaf tissue CO2 partial pressure (pCO2) shows contrasting dynamics over a diurnal cycle in C3 and Crassulacean Acid Metabolism (CAM) plants. However, simultaneous and continuous monitoring of pCO2 and pO2 in C3 and CAM plants under the same conditions was lacking. Our aim was to use a new CO2 microsensor and an existing O2 microsensor for non-destructive measurements of leaf pCO2 and pO2 dynamics to compare a C3 and a CAM plant in an aquatic environment. Methods A new amperometric CO2 microsensor and an O2 microsensor elucidated with high temporal resolution the dynamics in leaf pCO2 and pO2 during light–dark cycles for C3Lobelia dortmanna and CAM Littorella uniflora aquatic plants. Underwater photosynthesis, dark respiration, tissue malate concentrations and sediment CO2 and O2 were also measured. Key Results During the dark period, for the C3 plant, pCO2 increased to approx. 3.5 kPa, whereas for the CAM plant CO2 was mostly below 0.05 kPa owing to CO2 sequestration into malate. Upon darkness, the CAM plant had an initial peak in pCO2 (approx. 0.16 kPa) which then declined to a quasi-steady state for several hours and then pCO2 increased towards the end of the dark period. The C3 plant became severely hypoxic late in the dark period, whereas the CAM plant with greater cuticle permeability did not. Upon illumination, leaf pCO2 declined and pO2 increased, although aspects of these dynamics also differed between the two plants. Conclusions The continuous measurements of pCO2 and pO2 highlighted the contrasting tissue gas compositions in submerged C3 and CAM plants. The CAM leaf pCO2 dynamics indicate an initial lag in CO2 sequestration to malate, which after several hours of malate synthesis then slows. Like the use of O2 microsensors to resolve questions related to plant aeration, deployment of the new CO2 microsensor will benefit plant ecophysiology research. |
Author | Revsbech, Niels P Garcia-Robledo, Emilio Pedersen, Ole Colmer, Timothy D |
AuthorAffiliation | 1 Freshwater Biological Laboratory, Department of Biology, University of Copenhagen, Copenhagen, Denmark 3 Microbiology, Department of Bioscience, Aarhus University, Aarhus C, Denmark 4 Ecology, Department of Biology, University of Cadiz, Poligono Rio San Pedro, Puerto Real, Cadiz, Spain 2 UWA School of Agriculture and Environment, Faculty of Science, The University of Western Australia, Crawley, WA, Australia |
AuthorAffiliation_xml | – name: 3 Microbiology, Department of Bioscience, Aarhus University, Aarhus C, Denmark – name: 2 UWA School of Agriculture and Environment, Faculty of Science, The University of Western Australia, Crawley, WA, Australia – name: 4 Ecology, Department of Biology, University of Cadiz, Poligono Rio San Pedro, Puerto Real, Cadiz, Spain – name: 1 Freshwater Biological Laboratory, Department of Biology, University of Copenhagen, Copenhagen, Denmark |
Author_xml | – sequence: 1 givenname: Ole surname: Pedersen fullname: Pedersen, Ole email: opedersen@bio.ku.dk organization: Freshwater Biological Laboratory, Department of Biology, University of Copenhagen, Copenhagen, Denmark – sequence: 2 givenname: Timothy D surname: Colmer fullname: Colmer, Timothy D organization: UWA School of Agriculture and Environment, Faculty of Science, The University of Western Australia, Crawley, WA, Australia – sequence: 3 givenname: Emilio surname: Garcia-Robledo fullname: Garcia-Robledo, Emilio organization: Microbiology, Department of Bioscience, Aarhus University, Aarhus C, Denmark – sequence: 4 givenname: Niels P surname: Revsbech fullname: Revsbech, Niels P organization: Microbiology, Department of Bioscience, Aarhus University, Aarhus C, Denmark |
BackLink | https://www.ncbi.nlm.nih.gov/pubmed/29893789$$D View this record in MEDLINE/PubMed |
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Keywords | sediment O microelectrode underwater photosynthesis Severinghaus electrode consumption Aerenchyma CO and O Crassulacean Acid Metabolism leaf CO loss shore-weed plant submergence root radial O |
Language | English |
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Background and Aims
Leaf tissue CO2 partial pressure (pCO2) shows contrasting dynamics over a diurnal cycle in C3 and Crassulacean Acid Metabolism... Leaf tissue CO2 partial pressure (pCO2) shows contrasting dynamics over a diurnal cycle in C3 and Crassulacean Acid Metabolism (CAM) plants. However,... |
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Title | CO2 and O2 dynamics in leaves of aquatic plants with C3 or CAM photosynthesis – application of a novel CO2 microsensor |
URI | https://www.ncbi.nlm.nih.gov/pubmed/29893789 https://pubmed.ncbi.nlm.nih.gov/PMC6153474 |
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