Plant Physiol. Illumina
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Plant Physiology 62:693-695 (1978)
© 1978 American Society of Plant Biologists

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Effect of L-Canavanine on Nitrate Reductase in Corn Roots 1

Muhammad Aslam2, Ann Oaks3 and Ingrid Boesel

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

L-Canavanine inhibits the appearance of nitrate reductase (NADH-nitrate oxidoreductase, EC 1.6.6.1) in both root tips and mature root sections of corn (Zea mays L.). Ten-fold more canavanine was required to cause a 50% reduction in the level of nitrate reductase activity (NRA) in root tips than in mature root sections. For example with one particular batch of seeds 500 µM canavanine was effective in root tips whereas only 50 µM was required in mature root sections. In root tips arginine (1 mM) completely reversed the effect of 1 mM canavanine. In mature root sections higher concentrations of arginine (approximately 5 mM) were required for a complete reversal of the canavanine effect. Additions of canavanine to roots after a period of 3 hours with 5 mM KNO3 resulted in a loss of NRA. NO3– protected nitrate reductase from this inactivation in both root tip and mature root sections.

2 Present address: Plant Growth Laboratory, University of California, Davis, California 95616.

3 To whom reprint requests should be addressed.

1 This work was supported by National Research Council of Canada Grant A-2818.






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Copyright © 1978 by the American Society of Plant Biologists