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Plant Physiology 57:59-62 (1976)
© 1976 American Society of Plant Biologists

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Articles

Nitrate Absorption by Barley

II. Influence of Nitrate Reductase Activity 1

K. Prasad Rao and D. William Rains

a Department of Agronomy and Range Science, University of California, Davis, California 95616

The influence of protein synthesis and nitrate reductase activity on nitrate absorption by barley (Hordeum vulgare L.) was investigated. Cycloheximide decreased nitrate absorption. Pretreatment studies showed that cycloheximide affects either energy transfer or nitrate reductase activity or both.

Illumination increased plant capacity for nitrate absorption, possibly through increased energy supply and/or increased nitrate reductase activity. There was a positive correlation between nitrate reductase activity and light. Inhibiting the development of nitrate reductase activity by tungstate decreased nitrate absorption.

At least two nitrate transport systems are thus proposed in barley: one operating in the dark, with little nitrate reductase activity detectable; and one closely correlated with nitrate reductase activity. Total absorption is the sum of dark absorption and absorption facilitated by nitrate reductase.

1 Research was supported in part by Kearney Research Foundation.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1976 by the American Society of Plant Biologists