SS1 — Triticum turgidum subsp. durum

Summary

TRITD7AV1G035470 (SS1, TtSS1) on durum wheat chromosome 7A encodes a starch synthase with alpha-1,4-glucan glucosyltransferase activity (EC 2.4.1.21), a member of the glycosyl transferase family 1 and starch synthase catalytic domain family. The gene is associated with starch and amylopectin biosynthesis, amyloplast and plastid localisation, and endosperm development. It has been linked to amylose content, starch granule formation, amylopectin chain length and synthesis, as well as heading and flowering dates. Studies of related genes in other species connect the family to altered starch composition with increased amylose and modified amylopectin structure, apparent amylose content, pasting viscosity and gelatinization temperature. Sequence similarity further associates the family with grain yield, seed weight, grain size and shape, starch content, cold tolerance, and days to heading and maturity.