GBSS1 — Oryza sativa Japonica

Summary

OS07G0412100 (GBSS1, also known as GBSSII) in rice (Oryza sativa Japonica) on chromosome 7 encodes a protein with alpha-1,4-glucan glucosyltransferase (NDP-glucose donor) activity (EC 2.4.1.242) and starch synthase activity, a member of the GS/SS and starch synthase catalytic domain families. The gene is associated with regulation of starch biosynthetic process, starch metabolism, seed development, and hormone anabolism, as well as brassinosteroid mediated signalling, cell division, and cell cycle. Its product localises to the chloroplast starch grain, amyloplast, and chloroplast stroma. GBSS1 is associated with amylose content, grain thickness, width, weight, yield, panicle and spikelet density, starch content, cold and drought tolerance, photosynthetic rate, and nitrate uptake. Related genes in other species are linked to amylose synthesis and organ size.