Abstract
This short review summarizes recent experimental data on root plasma-membrane-bound nitrate reductase (PM-NR) mainly from tobacco roots. Although root PM-NR apparently comprises the same domains for partial reactions as leaf PM-NR and the soluble NR of roots and leaves, only this enzyme uses succinate as electron donor, in addition to NADH. Various properties and the regulation of root PM-NR by the preceding nitrate nutrition of the plants differ considerably, not only from soluble NR in the roots, but also from soluble NR and PM-NR in the leaves of the same plants.
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