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Plant Physiology 44:85-88 (1969)
© 1969 American Society of Plant Biologists

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Articles

Substrate Induction of Nitrate Reductase in Barley Aleurone Layers 1

T. E. Ferrari and J. E. Varner

a Department of Horticulture and MSU/AEC Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48823

Nitrate induces the formation of nitrate reductase activity in barley (Hordeum vulgare L. cv. Himalaya) aleurone layers. Previous work has demonstrated de novo synthesis of {alpha}-amylase by gibberellic acid in the same tissue. The increase in nitrate reductase activity is inhibited by cycloheximide and 6-methylpurine, but not by actinomycin D. Nitrate does not induce {alpha}-amylase synthesis, and it has no effect on the gibberellic acid-induced synthesis of {alpha}-amylase. Also, there is little or no direct effect of gibberellic acid (during the first 6 hr of induction) or of abscisic acid on the nitrate-induced formation of nitrate reductase. Gibberellic acid does interfere with nitrate reductase activity during long-term experiments (greater than 6 hr). However, the time course of this inhibition suggests that the inhibition may be a secondary one. Barley aleurone layers therefore provide a convenient tissue for the study of both substrate- and hormone-induced enzyme formation.

1 Research carried out under United States Atomic Energy Commission Contract No. AT (11-1)-1338. Michigan Agricultural Experiment Station Journal Article No. 4514.




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Copyright © 1969 by the American Society of Plant Biologists