Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 66:212-214 (1980)
© 1980 American Society of Plant Biologists

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Articles

Activation of Nitrate Reductase by Extracts from Corn Scutella 1

Tomoyuki Yamaya2 and Ann Oaks3

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

NADH-nitrate reductase (NR) from the primary leaves and root tips of corn seedlings (var. W64A x W182E) were activated by extracts from corn scutella. The activator extracted in potassium phosphate buffer (pH 7.5) or 80% (v/v) ethanol and fractionated by Dowex 1 (acetate) and Dowex 50 (H+) resins was recovered in the cationic fraction. The activator was not detected in extracts from shoots, roots, or endosperm of the seedlings. It activated the nitrate-induced cytochrome c reductase of NR complex but had slight inhibitory effects on the activities of FMNH2-NR and reduced methylviologen-NR. In addition the activator inhibited the activities of purified NR-inactivating proteins from corn roots (var. Wf9 x 38-11) and rice cell cultures.

2 Present address: MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824.

3 To whom reprint requests should be addressed.

1 This research was supported by Grant A-2818 from the National Science and Engineering Research Council of Canada.






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Copyright © 1980 by the American Society of Plant Biologists