SS1 — Oryza sativa Indica Group

Summary

BGIOSGA021860 (SS1) in Indica rice encodes a starch synthase with alpha-1,4-glucan glucosyltransferase activity (EC 2.4.1.21), placing it in the GS/SS family with a starch synthase catalytic domain. The protein localizes to the amyloplast, chloroplast stroma, and plastid. SS1 is associated with starch and amylopectin anabolism, endosperm and seed development, and structural organization. It has been connected to seed length, weight, shattering, starch content, glucose content, amylose content, starch granule formation, and amylopectin chain length and synthesis. Studies of related genes in other species link the family to starch biosynthesis, altered starch composition with increased amylose and modified amylopectin structure, and starch metabolism. Sequence similarity connections in other cereals associate the family with grain yield, weight, size, shape, texture, hardness, floury endosperm, amylopectin content, starch paste viscosity, gelatinization temperature, cold tolerance, plant height, heading date, and seed dormancy.