PMID: 11607591Nov 21, 1995Paper

The oxygen and carbon dioxide compensation points of C3 plants: possible role in regulating atmospheric oxygen

Proceedings of the National Academy of Sciences of the United States of America
N E TolbertE Beck

Abstract

The O2 and CO2 compensation points (O2 and CO2) of plants in a closed system depend on the ratio of CO2 and O2 concentrations in air and in the chloroplast and the specificities of ribulose bisphosphate carboxylase/oxygenase (Rubisco). The photosynthetic O2 is defined as the atmospheric O2 level, with a given CO2 level and temperature, at which net O2 exchange is zero. In experiments with C3 plants, the O2 with 220 ppm CO2 is 23% O2; O2 increases to 27% with 350 ppm CO2 and to 35% O2 with 700 ppm CO2. At O2 levels below the O2, CO2 uptake and reduction are accompanied by net O2 evolution. At O2 levels above the O2, net O2 uptake occurs with a reduced rate of CO2 fixation, more carbohydrates are oxidized by photorespiration to products of the C2 oxidative photosynthetic carbon cycle, and plants senesce prematurely. The CO2 increases from 50 ppm CO2 with 21% O2 to 220 ppm with 100% O2. At a low CO2/high O2 ratio that inhibits the carboxylase activity of Rubisco, much malate accumulates, which suggests that the oxygen-insensitive phosphoenolpyruvate carboxylase becomes a significant component of the lower CO2 fixation rate. Because of low global levels of CO2 and a Rubisco specificity that favors the carboxylase activity, relative...Continue Reading

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Citations

Dec 19, 2000·Biochemical and Biophysical Research Communications·P SivakumarP Pardha Saradhi
Jan 25, 2006·Photosynthesis Research·Abir U Igamberdiev, Peter J Lea
Jun 1, 1997·Annual Review of Plant Physiology and Plant Molecular Biology·N. E. Tolbert
Oct 26, 2000·Proceedings of the National Academy of Sciences of the United States of America·D J Beerling, R A Berner
Sep 11, 2009·The Biochemical Journal·Wendy L AllanBarry J Shelp
Jul 30, 2016·Frontiers in Plant Science·Abir U Igamberdiev, Alexander T Eprintsev
Jul 21, 2016·Biochimica Et Biophysica Acta·Nikolaos E IoannidisVangelis Daskalakis
Nov 29, 2013·Scientific Reports·Vladimir Lysenko, Tatyana Varduny
Dec 1, 2017·Astrobiology·Giada ArneyVictoria S Meadows
Dec 29, 2000·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·A WinglerR C Leegood
May 20, 2008·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Euan G Nisbet, R Ellen R Nisbet
Jul 22, 2014·Journal of Integrative Plant Biology·Alexandra FlorianAlisdair R Fernie
May 10, 2017·Interface Focus·Anthony Trewavas
Aug 14, 2001·Plant Physiology·Y P CenD B Layzell

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