Plant Physiol. Drug Metab Dispos
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Plant Physiology 59:86-90 (1977)
© 1977 American Society of Plant Biologists

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Articles

Quantum Yields for CO2 Uptake in C3 and C4 Plants

Dependence on Temperature, CO2, and O2 Concentration 1

James Ehleringera and Olle Björkmanb

a Department of Plant Biology, Carnegie Institution of Washington, Stanford, California 94305, Department of Biological Sciences, Stanford University, Stanford, California 94305

The quantum yields of C3 and C4 plants from a number of genera and families as well as from ecologically diverse habitats were measured in normal air of 21% O2 and in 2% O2. At 30 C, the quantum yields of C3 plants averaged 0.0524 ± 0.0014 mol CO2/absorbed einstein and 0.0733 ± 0.0008 mol CO2/absorbed einstein under 21 and 2% O2. At 30 C, the quantum yields of C4 plants averaged 0.0534 ± 0.0009 mol CO2/absorbed einstein and 0.0538 ± 0.0011 mol CO2/absorbed einstein under 21 and 2% O2. At 21% O2, the quantum yield of a C3 plant is shown to be strongly dependent on both the intercellular CO2 concentration and leaf temperature. The quantum yield of a C4 plant, which is independent of the intercellular CO2 concentration, is shown to be independent of leaf temperature over the ranges measured. The changes in the quantum yields of C3 plants are due to changes in the O2 inhibition. The evolutionary significance of the CO2 dependence of the quantum yield in C3 plants and the ecological significance of the temperature effects on the quantum yields of C3 and C4 plants are discussed.

1 C.I.W.-D.P.B. Publication No. 577.




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Copyright © 1977 by the American Society of Plant Biologists