SBE3 — Oryza sativa Indica Group

Summary

BGIOSGA006344 (SBE3, also known as SBEIIB) on chromosome 2 of Indica rice encodes a 1,4-alpha-glucan branching enzyme with isoamylase activity, a member of the glycoside hydrolase family 13. The gene is associated with starch biosynthesis, amylopectin formation, and amyloplast organization, and is linked to starch metabolism, glycogen anabolism, and embryo development ending in seed dormancy. It localizes to the amyloplast and isoamylase complex. Associations with grain shape, amylose content, starch content, grain weight, and photosynthetic rate have been noted. Studies of related genes in other species link the family to grain amylopectin content, starch gelatinization temperature, endosperm texture, seed weight, and seedling vigor.