GS1 — Triticum aestivum

Summary

TRAESCS2A02G500400 (GS1/GS2) on wheat chromosome 2A encodes a glutamine synthetase (EC 6.3.1.2) with a Gln_synt_N domain, and is also annotated with glutamate-tRNA ligase, histone acetyltransferase, SUMO transferase, and calmodulin-binding activities. The gene is associated with nitrogen metabolism, the ammonia assimilation cycle, nitrogen fixation and utilization, nitrate import, ureide breakdown, and nucleotide salvage. It has been linked to grain nitrogen and protein content, grain yield, grain number, harvest index, ear number, tiller number, grains per spike, flag leaf senescence, leaf chlorophyll content, photosynthetic rate, stomatal traits, heat tolerance, stripe rust, and abscisic acid sensitivity. Localization evidence connects the product to the chloroplast thylakoid, stroma, and envelope, as well as the cytosol, apoplast, and plasmodesmata. Related genes in other species link the family to drought, salt, osmotic, and cadmium stress responses, as well as grain filling and development.