NAS1 — Oryza sativa Japonica

Summary

OsNAS1 (OS07G0689600) encodes a nicotianamine synthase with nicotianamine synthase activity (EC 2.5.1.43), belonging to the Nicotian_synth domain family and the SAM-dependent methyltransferase superfamily. In rice, OsNAS1 is associated with saline-alkaline stress tolerance, vascular bundle and xylem development, and ethylene response. The gene is linked to grain zinc and iron content, root and shoot traits, zinc deficiency response, endosperm development, and iron translocation. Annotated biological processes include nicotianamine anabolism, phytoalexin biosynthesis, response to iron and zinc, seed maturation, phloem transport, and chlorophyll and starch anabolism. Associations with seedling height, panicle length, grain weight, grain yield, plant height, chlorophyll content, heat tolerance, and iron concentration have been recorded. Studies of related genes in other species link the nicotianamine synthase family to iron transport, metal homeostasis, and cadmium detoxification.