NR — Brassica oleracea var. botrytis

Summary

BoNR, the cauliflower gene on chromosome 8, encodes a nitrate reductase (NADPH) enzyme with additional annotated activities including cytochrome-b5 reductase, sulfite oxidase, and cytokinin riboside 5'-monophosphate phosphoribohydrolase activity, and contains molybdenum cofactor-binding and FAD-binding domains. The gene is associated with regulation of nitrate assimilation, nitric oxide biosynthesis, cytokinin anabolism, and sulfur metabolism, as well as responses to L-glutamate, potassium starvation, and salicylic acid. It is linked to numerous traits including nitrogen use efficiency, nitrate transport and sensitivity, seed oil content, freezing tolerance, flowering time, root development, stomatal function, disease susceptibility, and responses to aluminum, copper, and osmotic stress. Studies of related genes in other species connect the family to nitrate reduction, nitric oxide generation, lateral root development, gravitropic response, and resistance to pathogens including Botrytis cinerea and Verticillium dahliae.