GLN — Daucus carota subsp. sativus

Summary

DCAR_014164, designated DcGLN on carrot chromosome 4, encodes a glutamine synthetase (EC 6.3.1.2) characterized by glutamine synthetase catalytic and N-terminal domains. The enzyme is associated with the ammonia assimilation cycle, nitrate assimilation, and glutamine biosynthesis. DcGLN has been linked to leaf senescence, response to abscisic acid, cadmium response, and blue light response, as well as regulation of gene expression and flower development. Localization evidence connects the gene product to the chloroplast thylakoid membrane, plastid, and cytosol. Trait associations include photosynthetic rate, respiration rate, starch grain synthesis, stomatal opening, flowering time, and hypocotyl morphology. Phenotypic associations involve root development, seed yield, germination, nitrogen remobilization, ammonium homeostasis, and salt and cold stress tolerance. Studies of related genes in other species link the family to lateral root development, ammonium tolerance, and nitrogen assimilation.