GLN — Daucus carota subsp. sativus

Summary

DCAR_003425 (DcGLN) on carrot chromosome 1 encodes a glutamine synthetase (EC 6.3.1.2) with a Gln_synth_cat_dom domain. 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, starch grain synthesis, photoperiod-sensitive flowering time, stomatal opening, and hypocotyl morphology. Associations with root development, seed yield, germination, nitrogen remobilisation, ammonium metabolism, salt stress response, cold stress tolerance, and ROS homeostasis have also been noted. The product localises to the chloroplast thylakoid membrane, plastid, apoplast, plant-type cell wall, and vacuole. Studies of related genes in other species link the family to ammonium tolerance, lateral root development, and circadian rhythm.