The Role of NO3— and NH4+ Ions in the Regulation of Nitrate Reductase in Higher Plants
After its identification by Evans and Nason (1953), nitrate reductase (NR) was shown to be a substrate inducible enzyme by Tang and Wu (1957). In 1960 Hageman and Flesher demonstrated further that both light and NO3 − were required for the appearance of nitrate reductase activity (Hageman and Flesher 1960). Since that time there have been many reports confirming the initial observations with light and NO3 − and conflicting reports concerning the repression of the induction of NR by NH4 + (Beevers and Hageman 1972; Ullrich 1987).
KeywordsMaize Agar Electrophoresis Pyridine Polypeptide
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