SS1 — Triticum turgidum subsp. durum

Summary

TRITD7BV1G005840, designated SS1 (TtSS1), on durum wheat chromosome 7B encodes a starch synthase with alpha-1,4-glucan glucosyltransferase (NDP-glucose donor) activity (EC 2.4.1.21). The product localises to the amyloplast, chloroplast stroma and plastid, and is associated with amylopectin and starch anabolism, endosperm development, and pathways including starch biosynthesis and regulatory networks of nutrient accumulation. This gene has been connected to amylose content, starch granule formation, amylopectin chain length and synthesis, heading date, flowering date, and nematode resistance. Related genes in other species link the family to altered starch composition with increased amylose and modified amylopectin structure, apparent amylose content, pasting viscosity and gelatinization temperature.