PSY — Daucus carota subsp. sativus

Summary

DCAR_024333 (PSY, PSY1) on carrot chromosome 7 encodes a protein with squalene/phytoene synthase and isoprenoid synthase domains and EC 2.5.1.32 activity. This gene is associated with carotenoid anabolism and breakdown, carotene and lycopene anabolism, monoterpene and isoprenoid biosynthesis, and hormone anabolism. It is linked to chromoplast and chloroplast organization, photoprotection, photomorphogenesis, de-etiolation, shade avoidance, secondary growth, and post-transcriptional gene silencing. The gene has been connected to root color, carotene and alpha-carotene content, chlorophyll content, photosynthetic rate, respiration rate, flowering time, fruit growth and development, ethylene sensitivity, cell elongation, and parasitic weed response. Related genes in other species link the family to fruit carotenoid content and ripening, abscisic acid production, drought tolerance, and stress responses. The protein localizes to plastids, chromoplast stroma, etioplasts, chloroplast membranes, mitochondria, cytosol, and nucleus.