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Plant Physiology 55:652-657 (1975)
© 1975 American Society of Plant Biologists

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Articles

Postillumination Burst of Carbon Dioxide in Crassalacean Acid Metabolism Plants 1

Clifton E. Crews, H. Max Vines and Clanton C. Black, Jr.

a Departments of Horticulture and of Botany, University of Georgia, Athens, Georgia 30602

Immediately following exposure to light, a postillumination burst of CO2 has been detected in Crassulacean acid metabolism plants. A detailed study with pineapple (Ananas comosus) leaves indicates that the postillumination burst changes its amplitude and kinetics during the course of a day. In air, the postillumination burst in pineapple leaves generally is exhibited as two peaks. The postillumination burst is sensitive to atmospheric CO2 and O2 concentrations as well as to the light intensity under which plants are grown. We propose that the CO2 released in the first postillumination burst peak is indicative of photorespiration since it is sensitive to either O2 or CO2 concentration while the second CO2 evolution peak is likely due to decarboxylation of organic acids involved in Crassulacean acid metabolism.

In marked contrast to other higher plants, the postillumination burst in Crassulacean acid metabolism plants can be equal to or greater than the rate of photosynthesis. Photosynthesis in pineapple leaves also varies throughout a day. Both photosynthesis and the postillumination burst have a daily variation which apparently is a complex function of degree of leaf acidity, growth light intensity, ambient gas phase, and the time a plant has been exposed to a given gas.

1 This research supported in part by a Dawson Postdoctoral Fellowship and by National Science Foundation Grant GB-20661.






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