Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 73:555-559 (1983)
© 1983 American Society of Plant Biologists

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Articles

Variation in Quantum Yield for CO2 Uptake among C3 and C4 Plants 1

James Ehleringer and Robert W. Pearcy

Department of Biology, University of Utah, Salt Lake City, Utah 84112, Department of Botany, University of California, Davis, California 95616

The quantum yield for CO2 uptake was measured on a number of C3 and C4 monocot and dicot species. Under normal atmospheric conditions (330 microliters per liter CO2, 21% O2) and a leaf temperature of 30°C, the average quantum yields (moles CO2 per einstein) were as follows: 0.052 for C3 dicots, 0.053 for C3 grasses, 0.053 for NAD-malic enzyme type C4 dicots, 0.060 for NAD-malic enzyme type C4 grasses, 0.064 for phosphoenolpyruvate carboxykinase type C4 grasses, 0.061 for NADP-malic enzyme C4 dicots, and 0.065 for NADP-malic enzyme type C4 grasses. The quantum yield under normal atmospheric conditions was temperature dependent in C3 species, but apparently not in C4 species. Light and temperature conditions during growth appeared not to influence quantum yield. The significance of variation in the quantum yields of C4 plants was discussed in terms of CO2 leakage from the bundle sheath cells and suberization of apoplastic regions of the bundle sheath cells.

1 Supported by National Science Foundation grants 81-13136 and 79-21826 and by grant 81-CRCR-1-1152 from the Competitive Research Grants Office of the United States Department of Agriculture.




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