B29 — Zea mays

Summary

ZmB29 (also known as ZmNIA1, GNR1, and NIA2) on maize chromosome 4 encodes a protein with nitrate reductase (NADPH) activity (EC 1.7.1.1), NADH:nitrate reductase activity, molybdenum cofactor binding, FAD binding, and cytochrome-b5 reductase activity. The gene is associated with nitrate metabolism, nitrate assimilation, and the denitrification pathway. It is linked to grain nitrogen content, grain moisture content, biological yield, ear weight, leaf area duration, crop growth rate, canopy temperature, and leaf water potential. ZmB29 is also associated with nitrogen use efficiency, nitrogen uptake, nitrate deficiency tolerance, salt stress tolerance, flowering time, root development, aphid resistance, disease susceptibility, and nitric oxide production. The encoded protein localizes to the chloroplast stroma, plant-type cell wall, and apoplast.