GS1 — Triticum turgidum subsp. durum

Summary

TRITD4AV1G192600 (GS1, TtGS1) on durum wheat chromosome 4A encodes a glutamine synthetase (EC 6.3.1.2) with a Gln_synt_N domain and a catalytic domain. The gene is associated with nitrogen metabolism, glutamine synthesis, and the ammonia assimilation cycle. It has been linked to grain protein content, grain weight, grain size, and the grain filling period, as well as leaf senescence, flowering time, and photoperiod-sensitive flowering. Additional associations include responses to abscisic acid, cadmium, and blue light, starch grain synthesis, photosynthetic rate, stomatal opening, and chloroplast development. The encoded protein localises to the chloroplast thylakoid membrane, chloroplast envelope, stroma, and plant-type vacuole. Studies of related genes in other species link the family to root development and to drought and salt stress tolerance.