Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 69:371-374 (1982)
© 1982 American Society of Plant Biologists

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Effect of Photoinhibitory Treatments on the Activity of Light-Activated Enzymes of C3 and C4 Photosynthetic Carbon Metabolism

Stephen B. Powles1, Keith S. R. Chapman and F. R. Whatley

Department of Environmental Biology, Research School of Biological Sciences, Australian National University, Canberra City, Australian Capital Territory 2601, Division of Plant Industry, Commonwealth Scientific and Industrial Research Organization, Canberra City, Australian Capital Territory 2601, Botany School, University of Oxford, Oxford, OXI 3RA, United Kingdom

Exposure of maize leaves to a 3-hour photoinhibitory treatment (photon flux rate of 2,000 microeinsteins meter–2 second–1, CO2-free air) resulted in lower activities of the light-activated enzymes NADP malate dehydrogenase, pyruvate, Pi dikinase, and ribulose-5-phosphate kinase. The activities could be recovered partially either by incubating enzyme extracts with dithiothreitol or by illuminating the treated leaf in air. Several enzymes which are not light-activated were not affected by the treatment. Ribulose-5-phosphate kinase activity was also reduced when bean plants grown in low light were subjected to a similar photoinhibitory treatment.

It is suggested that, although the reactivation of these enzymes may be correlated with the short term increase of CO2 uptake capacity observed when photoinhibited leaves are returned to illumination in air, inactivation of these enzymes does not contribute significantly to the long term in vivo expression of photoinhibition observed after 2 to 4 hours.

The results provide an example of partial inactivation of light-activated enzymes under illumination equivalent to full sunlight.

1 Present address: Carnegie Institution of Washington, 290 Panama St., Stanford, CA 94305.






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