SS4 — Oryza sativa Indica Group

Summary

BGIOSGA020250 (SS4, OiSS4) on chromosome 5 of Indica rice encodes a protein with GS/SS, Starch_synth_cat_dom, and Glyco_trans_1 domains, possessing starch synthase, glycogen (starch) synthase, phosphoglucomutase, mannan synthase, and transglycosidase activities, along with starch-binding and magnesium-binding properties. The gene is associated with starch, amylopectin, and mannan metabolism, cell wall pectin biosynthesis, endosperm and seed development, photoprotection, and responses to cold and abscisic acid. It is linked to amylose, starch, glucose, anthocyanin, and jasmonic acid content, grain size, shoot growth angle, pericarp color, root morphology, and plant growth and development traits. Localization evidence connects the product to amyloplasts, chloroplast thylakoids, thylakoid lumen, stromules, and Golgi. Related genes in other species link the family to starch granule initiation, number, and diurnal turnover, as well as mannan biosynthesis.