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Plant Physiology 84:578-581 (1987)
© 1987 American Society of Plant Biologists

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Metabolism and Enzymology

Influence of Light on the Ferredoxin-Dependent Glutamate Synthase in Maize Leaves 1

Akira Suzuki2, Céline Audet and Ann Oaks

Department of Biology, McMaster University, Hamilton, Ontario, Canada L8S 4K1

The ferredoxin (Fd)-dependent glutamate synthase (EC 1.4.7.1) and NADH-dependent glutamate synthase (EC 1.4.1.14) activities are carried out by two immunochemically distinct enzyme proteins in maize leaves (Zea mays W64A and W182E). Continuous irradiation of etiolated tissue at 75 micro einsteins per square meter per second for 24 hours resulted in a 3-fold increase on a fresh weight basis in the activity of the Fd-dependent glutamate synthase and a slight decrease in the activity of the NADH-dependent enzyme. There was also a significant increase of the Fd-glutamate synthase protein during greening of etiolated tissue.

2 Current address: Laboratoire du Métabolisme et de la Nutrition des Plantes, I.N.R.A., Route de Saint-Cyr, 78000 Versailles, France.

1 Research support by operating grant A2818 from the Natural Sciences and Engineering Research Council of Canada.






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Copyright © 1987 by the American Society of Plant Biologists