GS1 — Triticum aestivum

Summary

TRAESCS4D02G240700 (TaGS1) on wheat chromosome 4D encodes a glutamine synthetase (EC 6.3.1.2) with a Gln_synt_N domain and glutamine synthetase activity. The gene is associated with nitrogen metabolism, the ammonia assimilation cycle, nitrate assimilation, photorespiration, and ureide breakdown. It has been linked to numerous agronomic traits including grain yield, grain number, grain weight, grain protein content, harvest index, tiller number, ear number, grains per spike, plant height, flag leaf senescence, leaf senescence, chlorophyll content, photosynthetic rate, starch grain synthesis, grain filling period, flowering time, root length, and abscisic acid sensitivity. The encoded protein localizes to the chloroplast thylakoid membrane, chloroplast stroma, chloroplast envelope, apoplast, and plasmodesmata. Studies of related genes in other species link the family to drought, salt, and osmotic stress tolerance, as well as grain filling and nitrogen recycling.