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Studying in vivo dynamics of xylem-transported 11CO2 using positron emission tomography

Jens Mincke (UGent) , Jan Courtyn (UGent) , Christian Vanhove (UGent) , Stefaan Vandenberghe (UGent) and Kathy Steppe (UGent)
(2020) TREE PHYSIOLOGY. 40(8). p.1058-1070
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Abstract
Respired CO2 in woody tissues can build up in the xylem and dissolve in the sap solution to be transported through the plant. From the sap, a fraction of the CO2 can either be radially diffuse to the atmosphere or be assimilated in chloroplasts present in woody tissues. These processes occur simultaneously in stems and branches, making it difficult to study their specific dynamics. Therefore, an 11C-enriched aqueous solution was administered to young branches of Populus tremula L., which were subsequently imaged by positron emission tomography (PET). This approach allows in vivo visualization of the internal movement of CO2 inside branches at high spatial and temporal resolution, and enables direct measurement of the transport speed of xylem-transported CO2 (vCO2). Through compartmental modeling of the dynamic data obtained from the PET images, we (i) quantified vCO2 and (ii) proposed a new method to assess the fate of xylem-transported 11CO2 within the branches. It was found that a fraction of 0.49 min−1 of CO2 present in the xylem was transported upwards. A fraction of 0.38 min−1 diffused radially from the sap to the surrounding parenchyma and apoplastic spaces (CO2,PA) to be assimilated by woody tissue photosynthesis. Another 0.12 min−1 of the xylem-transported CO2 diffused to the atmosphere via efflux. The remaining CO2 (i.e., 0.01 min−1) was stored as CO2,PA, representing the build-up within parenchyma and apoplastic spaces to be assimilated or directed to the atmosphere. Here, we demonstrate the outstanding potential of 11CO2-based plant-PET in combination with compartmental modeling to advance our understanding of internal CO2 movement and the respiratory physiology within woody tissues.
Keywords
(CO2)-C-11, carbon-11 (C-11), CO2 recycling, CO2 refixation, plant-PET, radial CO2 diffusion, stem photosynthesis, stem respiration, woody tissue photosynthesis, xylem CO2 transport, WOODY TISSUE PHOTOSYNTHESIS, CO2 EFFLUX, CARBON-DIOXIDE, TREE STEMS, EXTERNAL FLUXES, RESPIRED CO2, RESPIRATION, BARK, ASSIMILATION, BRANCHES

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MLA
Mincke, Jens, et al. “Studying in Vivo Dynamics of Xylem-Transported 11CO2 Using Positron Emission Tomography.” TREE PHYSIOLOGY, vol. 40, no. 8, 2020, pp. 1058–70, doi:10.1093/treephys/tpaa048.
APA
Mincke, J., Courtyn, J., Vanhove, C., Vandenberghe, S., & Steppe, K. (2020). Studying in vivo dynamics of xylem-transported 11CO2 using positron emission tomography. TREE PHYSIOLOGY, 40(8), 1058–1070. https://doi.org/10.1093/treephys/tpaa048
Chicago author-date
Mincke, Jens, Jan Courtyn, Christian Vanhove, Stefaan Vandenberghe, and Kathy Steppe. 2020. “Studying in Vivo Dynamics of Xylem-Transported 11CO2 Using Positron Emission Tomography.” TREE PHYSIOLOGY 40 (8): 1058–70. https://doi.org/10.1093/treephys/tpaa048.
Chicago author-date (all authors)
Mincke, Jens, Jan Courtyn, Christian Vanhove, Stefaan Vandenberghe, and Kathy Steppe. 2020. “Studying in Vivo Dynamics of Xylem-Transported 11CO2 Using Positron Emission Tomography.” TREE PHYSIOLOGY 40 (8): 1058–1070. doi:10.1093/treephys/tpaa048.
Vancouver
1.
Mincke J, Courtyn J, Vanhove C, Vandenberghe S, Steppe K. Studying in vivo dynamics of xylem-transported 11CO2 using positron emission tomography. TREE PHYSIOLOGY. 2020;40(8):1058–70.
IEEE
[1]
J. Mincke, J. Courtyn, C. Vanhove, S. Vandenberghe, and K. Steppe, “Studying in vivo dynamics of xylem-transported 11CO2 using positron emission tomography,” TREE PHYSIOLOGY, vol. 40, no. 8, pp. 1058–1070, 2020.
@article{8663170,
  abstract     = {{Respired CO2 in woody tissues can build up in the xylem and dissolve in the sap solution to be transported through the plant. From the sap, a fraction of the CO2 can either be radially diffuse to the atmosphere or be assimilated in chloroplasts present in woody tissues. These processes occur simultaneously in stems and branches, making it difficult to study their specific dynamics. Therefore, an 11C-enriched aqueous solution was administered to young branches of Populus tremula L., which were subsequently imaged by positron emission tomography (PET). This approach allows in vivo visualization of the internal movement of CO2 inside branches at high spatial and temporal resolution, and enables direct measurement of the transport speed of xylem-transported CO2 (vCO2). Through compartmental modeling of the dynamic data obtained from the PET images, we (i) quantified vCO2 and (ii) proposed a new method to assess the fate of xylem-transported 11CO2 within the branches. It was found that a fraction of 0.49 min−1 of CO2 present in the xylem was transported upwards. A fraction of 0.38 min−1 diffused radially from the sap to the surrounding parenchyma and apoplastic spaces (CO2,PA) to be assimilated by woody tissue photosynthesis. Another 0.12 min−1 of the xylem-transported CO2 diffused to the atmosphere via efflux. The remaining CO2 (i.e., 0.01 min−1) was stored as CO2,PA, representing the build-up within parenchyma and apoplastic spaces to be assimilated or directed to the atmosphere. Here, we demonstrate the outstanding potential of 11CO2-based plant-PET in combination with compartmental modeling to advance our understanding of internal CO2 movement and the respiratory physiology within woody tissues.}},
  author       = {{Mincke, Jens and Courtyn, Jan and Vanhove, Christian and Vandenberghe, Stefaan and Steppe, Kathy}},
  issn         = {{0829-318X}},
  journal      = {{TREE PHYSIOLOGY}},
  keywords     = {{(CO2)-C-11,carbon-11 (C-11),CO2 recycling,CO2 refixation,plant-PET,radial CO2 diffusion,stem photosynthesis,stem respiration,woody tissue photosynthesis,xylem CO2 transport,WOODY TISSUE PHOTOSYNTHESIS,CO2 EFFLUX,CARBON-DIOXIDE,TREE STEMS,EXTERNAL FLUXES,RESPIRED CO2,RESPIRATION,BARK,ASSIMILATION,BRANCHES}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{1058--1070}},
  title        = {{Studying in vivo dynamics of xylem-transported 11CO2 using positron emission tomography}},
  url          = {{http://dx.doi.org/10.1093/treephys/tpaa048}},
  volume       = {{40}},
  year         = {{2020}},
}

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