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Transport of root-respired CO₂ via the transpiration stream affects aboveground carbon assimilation and CO₂ efflux in trees

(2013) NEW PHYTOLOGIST. 197(2). p.555-565
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Abstract
Upward transport of CO2 via the transpiration stream from belowground to aboveground tissues occurs in tree stems. Despite potentially important implications for our understanding of plant physiology, the fate of internally transported CO2 derived from autotrophic respiratory processes remains unclear. We infused a (CO2)-C-13-labeled aqueous solution into the base of 7-yr-old field-grown eastern cottonwood (Populus deltoides) trees to investigate the effect of xylem-transported CO2 derived from the root system on aboveground carbon assimilation and CO2 efflux. The C-13 label was transported internally and detected throughout the tree. Up to 17% of the infused label was assimilated, while the remainder diffused to the atmosphere via stem and branch efflux. The largest amount of assimilated C-13 was found in branch woody tissues, while only a small quantity was assimilated in the foliage. Petioles were more highly enriched in C-13 than other leaf tissues. Our results confirm a recycling pathway for respired CO2 and indicate that internal transport of CO2 from the root system may confound the interpretation of efflux-based estimates of woody tissue respiration and patterns of carbohydrate allocation.
Keywords
respiration, carbon allocation, roots, soil CO2 efflux, stable isotope, xylem transport, PLATANUS-OCCIDENTALIS L., INNER STEM TISSUES, POPULUS-DELTOIDES, XYLEM SAP, SOIL RESPIRATION, EXTERNAL FLUXES, PHOTOSYNTHESIS, DIOXIDE, PLANTS, BRANCHES

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Citation

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MLA
Bloemen, Jasper, Mary Anne McGuire, Doug P Aubrey, et al. “Transport of Root-respired CO₂ via the Transpiration Stream Affects Aboveground Carbon Assimilation and CO₂ Efflux in Trees.” NEW PHYTOLOGIST 197.2 (2013): 555–565. Print.
APA
Bloemen, J., McGuire, M. A., Aubrey, D. P., Teskey, R. O., & Steppe, K. (2013). Transport of root-respired CO₂ via the transpiration stream affects aboveground carbon assimilation and CO₂ efflux in trees. NEW PHYTOLOGIST, 197(2), 555–565.
Chicago author-date
Bloemen, Jasper, Mary Anne McGuire, Doug P Aubrey, Robert O Teskey, and Kathy Steppe. 2013. “Transport of Root-respired CO₂ via the Transpiration Stream Affects Aboveground Carbon Assimilation and CO₂ Efflux in Trees.” New Phytologist 197 (2): 555–565.
Chicago author-date (all authors)
Bloemen, Jasper, Mary Anne McGuire, Doug P Aubrey, Robert O Teskey, and Kathy Steppe. 2013. “Transport of Root-respired CO₂ via the Transpiration Stream Affects Aboveground Carbon Assimilation and CO₂ Efflux in Trees.” New Phytologist 197 (2): 555–565.
Vancouver
1.
Bloemen J, McGuire MA, Aubrey DP, Teskey RO, Steppe K. Transport of root-respired CO₂ via the transpiration stream affects aboveground carbon assimilation and CO₂ efflux in trees. NEW PHYTOLOGIST. 2013;197(2):555–65.
IEEE
[1]
J. Bloemen, M. A. McGuire, D. P. Aubrey, R. O. Teskey, and K. Steppe, “Transport of root-respired CO₂ via the transpiration stream affects aboveground carbon assimilation and CO₂ efflux in trees,” NEW PHYTOLOGIST, vol. 197, no. 2, pp. 555–565, 2013.
@article{3055508,
  abstract     = {Upward transport of CO2 via the transpiration stream from belowground to aboveground tissues occurs in tree stems. Despite potentially important implications for our understanding of plant physiology, the fate of internally transported CO2 derived from autotrophic respiratory processes remains unclear. 
We infused a (CO2)-C-13-labeled aqueous solution into the base of 7-yr-old field-grown eastern cottonwood (Populus deltoides) trees to investigate the effect of xylem-transported CO2 derived from the root system on aboveground carbon assimilation and CO2 efflux. 
The C-13 label was transported internally and detected throughout the tree. Up to 17% of the infused label was assimilated, while the remainder diffused to the atmosphere via stem and branch efflux. The largest amount of assimilated C-13 was found in branch woody tissues, while only a small quantity was assimilated in the foliage. Petioles were more highly enriched in C-13 than other leaf tissues. 
Our results confirm a recycling pathway for respired CO2 and indicate that internal transport of CO2 from the root system may confound the interpretation of efflux-based estimates of woody tissue respiration and patterns of carbohydrate allocation.},
  author       = {Bloemen, Jasper and McGuire, Mary Anne and Aubrey, Doug P and Teskey, Robert O and Steppe, Kathy},
  issn         = {0028-646X},
  journal      = {NEW PHYTOLOGIST},
  keywords     = {respiration,carbon allocation,roots,soil CO2 efflux,stable isotope,xylem transport,PLATANUS-OCCIDENTALIS L.,INNER STEM TISSUES,POPULUS-DELTOIDES,XYLEM SAP,SOIL RESPIRATION,EXTERNAL FLUXES,PHOTOSYNTHESIS,DIOXIDE,PLANTS,BRANCHES},
  language     = {eng},
  number       = {2},
  pages        = {555--565},
  title        = {Transport of root-respired CO₂ via the transpiration stream affects aboveground carbon assimilation and CO₂ efflux in trees},
  url          = {http://dx.doi.org/10.1111/j.1469-8137.2012.04366.x},
  volume       = {197},
  year         = {2013},
}

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