CCD1 — Daucus carota subsp. sativus

Summary

DCAR_022385 (CCD1, also known as DcCCD1 or DcNCED1) on carrot chromosome 6 encodes a carotenoid dioxygenase with 9-cis-epoxycarotenoid dioxygenase activity and metal binding, placing it in the carotenoid oxygenase family. In carrot, this gene is associated with drought response and flavor biosynthesis, as well as the breakdown of carotenoids, carotene, and xanthophylls, alongside anabolic processes for beta-carotene, lycopene, and abscisic acid. It is linked to responses to salicylate, gibberellin, auxin, thirst, and salinity, and to anther and pollen development, ABA signaling, and NO storage. The product localizes to the chloroplast stroma, cytosol, plasmalemma, Golgi, vacuole, and plasmodesmata. Associations with root color, carotene and carotenoid content, seed carotenoid content and degradation, abscisic acid biosynthesis, and volatile production have been noted. Studies of related genes in other species connect the family to fruit flavor, yield, ripening, color, and firmness, as well as drought, salt, cold, and chilling tolerance, and root development traits.