SS3 — Oryza sativa Indica Group

Summary

BGIOSGA014316 (SS3, OiSS3) on chromosome 4 of indica rice encodes a starch synthase with alpha-1,4-glucan glucosyltransferase (NDP-glucose donor) activity (EC 2.4.1.21), containing starch synthase catalytic and CBM25 starch-binding domains. The gene is associated with amylopectin and starch anabolism, regulation of starch metabolism, endosperm and seed development, and localizes to the amyloplast. It has been linked to starch content, grain size, chalky endosperm, glucose content, pericarp color, starch grain synthesis, and starch granule initiation and morphology. Studies of related genes in other species link the family to starch metabolism, amylopectin chain synthesis, and starch phosphate content, as well as grain yield, seed weight, grain appearance, floury endosperm, amylopectin content, drought tolerance, and tassel branch number.