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Plant Physiology 61:469-471 (1978)
© 1978 American Society of Plant Biologists

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Articles

Light Modulation of the Activity of Carbon Metabolism Enzymes in the Crassulacean Acid Metabolism Plant Kalanchoë 1

Vimal K. Gupta2 and Louise E. Anderson3

Department of Biological Sciences, University of Illinois at Chicago Circle, Box 4348, Chicago, Illinois 60680

When intact Kalanchoë plants are illuminated NADP-linked malic dehydrogenase and three enzymes of the reductive pentose phosphate pathway, ribulose-5-phosphate kinase, NADP-linked glyceraldehyde-3-phosphate dehydrogenase, and sedoheptulose-1,7-diphosphate phosphatase, are activated. In crude extracts these enzymes are activated by dithiothreitol treatment. Light or dithiothreitol treatment does not inactivate the oxidative pentose phosphate pathway enzyme glucose-6-phosphate dehydrogenase. Likewise, neither light, in vivo, nor dithiothreitol, in vitro, affects fructose-1,6-diphosphate phosphatase. Apparently the potential for modulation of enzyme activity by the reductively activated light effect mediator system exists in Crassulacean acid metabolism plants, but some enzymes which are light-dark-modulated in the pea plant are not in Kalanchoë.

2 On leave from the Department of Botany, G. B. Pant University, Pantnagar, India.

3 Address reprint requests to this author.

1 Supported by National Science Foundation Grant PCM 75-17068.






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Copyright © 1978 by the American Society of Plant Biologists