Measurement and interpretation of the oxygen isotope composition of carbon dioxide respired by leaves in the dark.

@article{Cernusak2004MeasurementAI,
  title={Measurement and interpretation of the oxygen isotope composition of carbon dioxide respired by leaves in the dark.},
  author={Lucas A Cernusak and Graham D Farquhar and Suan Chin Wong and Hilary Stuart-Williams},
  journal={Plant physiology},
  year={2004},
  volume={136 2},
  pages={3350-63}
}
We measured the oxygen isotope composition (delta(18)O) of CO(2) respired by Ricinus communis leaves in the dark. Experiments were conducted at low CO(2) partial pressure and at normal atmospheric CO(2) partial pressure. Across both experiments, the delta(18)O of dark-respired CO(2) (delta(R)) ranged from 44 per thousand to 324 per thousand (Vienna Standard Mean Ocean Water scale). This seemingly implausible range of values reflects the large flux of CO(2) that diffuses into leaves… CONTINUE READING

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