GLN — Daucus carota subsp. sativus

Summary

DcGLN (DCAR_023452) on carrot chromosome 7 encodes a glutamine synthetase, as indicated by its glutamine synthetase activity and conserved Gln_synt_N and Gln_synth_cat_dom domains. The gene is associated with the ammonia assimilation cycle, nitrate assimilation, leaf senescence, and responses to abscisic acid and cadmium. It has been linked to traits including photosynthetic rate, respiration rate, flowering time, starch grain synthesis, and stomatal opening. Phenotypic associations include seed yield, seed germination, root development, nitrogen remobilisation, ammonium homeostasis, salt and cold stress tolerance, and vegetative growth. The product localises to multiple compartments such as the chloroplast thylakoid membrane, plastid, cytosol, and plant-type vacuole. Studies of related genes in other species link the family to lateral root development, ammonium tolerance, and circadian rhythm.