NR — Arabidopsis thaliana

Summary

AT1G37130 (NR, NIA2) in Arabidopsis thaliana encodes a nitrate reductase (EC 1.7.1.1) with NADH:nitrate reductase activity, also annotated with cytokinin riboside 5'-monophosphate phosphoribohydrolase activity and multiple cofactor-binding domains including molybdenum, FAD and heme. The gene is associated with nitrate metabolism and assimilation, nitrogen utilization, nitric oxide metabolism, regulation of TOR signaling, and downregulation of systemic acquired resistance. Observed phenotypes include virus and herbicide resistance, salt stress resistance, and altered nitrogen accumulation. The gene has been connected to numerous agronomic traits including grain size, seed protein content, nitrate content, leaf width, root branching, biomass accumulation, flowering time, freezing tolerance, nitrogen use efficiency, and seed oil content. Localization evidence links the product to the preprophase band, cell cortex, stress granule, apoplast, and plant-type cell wall.