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

Plant Physiology
Lucas A CernusakHilary Stuart-Williams

Abstract

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, equilibrates with leaf water via the catalytic activity of carbonic anhydrase, then diffuses out of the leaf, leaving the net CO(2) efflux rate unaltered. The impact of this process on delta(R) is modulated by the delta(18)O difference between CO(2) inside the leaf and in the air, and by variation in the CO(2) partial pressure inside the leaf relative to that in the air. We developed theoretical equations to calculate delta(18)O of CO(2) in leaf chloroplasts (delta(c)), the assumed location of carbonic anhydrase activity, during dark respiration. Their application led to sensible estimates of delta(c), suggesting that the theory adequately accounted for the labeling of CO(2) by leaf water in excess of that expected from the net CO(2) efflux. The del...Continue Reading

References

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Nov 1, 2003·Functional Plant Biology : FPB·Lucas A CernusakGraham D Farquhar

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Citations

Jan 11, 2007·Plant Physiology·Graham D FarquharBelinda Barnes
Aug 8, 2014·Journal of Experimental Botany·Matti BarthelAlexander Knohl
Feb 28, 2007·Plant, Cell & Environment·Margaret M BarbourNate G McDowell
Jul 10, 2007·Plant, Cell & Environment·Matthias CuntzLucas A Cernusak
Feb 2, 2012·Plant, Cell & Environment·Graham D Farquhar, Lucas A Cernusak
Jun 17, 2011·Plant, Cell & Environment·Kyounghee Kim, Xuhui Lee
Dec 31, 2015·Plant, Cell & Environment·Lucas A CernusakGraham D Farquhar
Oct 6, 2016·Journal of Experimental Botany·Hannah L OsbornSusanne von Caemmerer
Nov 20, 2016·Plant, Cell & Environment·Karen E LoucosMargaret M Barbour
Apr 1, 2008·Journal of Experimental Botany·Asaph B CousinsSusanne von Caemmerer
May 1, 2008·Functional Plant Biology : FPB·Guillaume Tcherkez, Graham D Farquhar
Jul 9, 2016·Plant, Cell & Environment·Meisha Holloway-PhillipsGraham D Farquhar
May 1, 2005·Functional Plant Biology : FPB·Graham D Farquhar, Lucas A Cernusak
Jan 1, 2006·Functional Plant Biology : FPB·Margaret M BarbourGraham D Farquhar
Jul 9, 2021·Scientific Reports·Getachew Agmuas AdnewThomas Röckmann

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