Interaction Between \(N{O_3}^ - \), \(N{O_2}^ - \), and \(N{H_4}^ + \) During Assimilation in Detached Barley Leaves

  • S. S. Goyal
  • R. C. Huffaker


Numerous reports show that plants may utilize both NO3 and NH4 + ions as a source of nitrogen. In microorganisms, ammonium often feedback-inhibits NR activity and represses NR induction (Payne, 1973). Because NO3 reduction seems to occur in the cytoplasm (Beevers and Hageman, 1972; Neyra and Hageman, 1978) and NO2 and NH4 + are assimilated in the chloroplast, feedback-inhibition by products may not be as serious in green leaves. Little information is available concerning the effects of each of these nitrogenous compounds on the assimilation of the others. This paper deals with that problem.


Nitrate Reductase Assimilation Efficiency Light Darkness Barley Leave Radish Plant 
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Copyright information

© Plenum Press, New York 1981

Authors and Affiliations

  • S. S. Goyal
    • 1
  • R. C. Huffaker
    • 1
  1. 1.Plant Growth Laboratory and the Department of Agronomy and Range ScienceUniversity of CaliforniaDavisUSA

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