Assimilation of xylem-transported CO2 is dependent on transpiration rate but is small relative to atmospheric fixation.

@article{Bloemen2013AssimilationOX,
  title={Assimilation of xylem-transported CO2 is dependent on transpiration rate but is small relative to atmospheric fixation.},
  author={J. C. M. Bloemen and Mary Anne McGuire and Douglas P. Aubrey and Robert O. Teskey and Kathy Steppe},
  journal={Journal of experimental botany},
  year={2013},
  volume={64 8},
  pages={
          2129-38
        }
}
The effect of transpiration rate on internal assimilation of CO2 released from respiring cells has not previously been quantified. In this study, detached branches of Populus deltoides were allowed to take up (13)CO2-labelled solution at either high (high label, HL) or low (low label, LL) (13)CO2 concentrations. The uptake of the (13)CO2 label served as a proxy for the internal transport of respired CO2, whilst the transpiration rate was manipulated at the leaf level by altering the vapour… CONTINUE READING
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