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Early Effects of Illumination on the Activity of Some Photosynthetic Enzymes ¹

University of Chicago, Department of Botany, Chicago, Illinois 60637

Leaves of dark-grown corn (Zea mays) were illuminated for periods ranging from 3 minutes to 12 hours. The changes in the activities of ribose-5-phosphate isomerase, ribulose-5-phosphate kinase, and ribulose-1,5-diphosphate carboxylase were followed.

The activity of ribose-5-phosphate isomerase did not change significantly until between 12 and 24 hours of illumination. An increase in ribulose-5-phosphate kinase activity occurred after a lag of about 6 hours. The increase in carboxylase activity began after 3 minutes of illumination and increased until after 3 to 6 hours in the light, after which it began to decline. The increases in these enzymes appear to be the result of protein synthesis.

³ Present address: Department of Biophysics, University of Chicago.

⁴ Research Career Awardee of the National Institute of General Medical Sciences.

¹ This research was supported in part by grants from the National Science Foundation and The National Institutes of Health and in part by the Wallace C. and Clara A. Abbott Fund of the University of Chicago.

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