PSY — Nicotiana attenuata

Summary

A4A49_15187 (PSY, PSY1) in coyote tobacco (Nicotiana attenuata) encodes a phytoene synthase, an enzyme with phytoene synthase, squalene synthase, dimethylallyltransferase and farnesyltranstransferase activities (EC 2.5.1.32). The gene is associated with carotenoid and isoprenoid anabolism, monoterpene biosynthesis, pigmentation, chromoplast and chloroplast organization, de-etiolation, leaf senescence, osmotic response, response to light, embryo development, protein stabilization, and virus-induced PTGS. It localizes to plastids, chloroplast membranes, etioplasts, chromoplast stroma, mitochondria, cytosol and nucleus. Associations include fruit carotenoid content and color, fruit ripening, abscisic acid production, photosynthetic rate, respiration rate, flowering time, cell elongation, and chloroplast development. Studies of related genes in other species link the family to grain width, carotenoid and lycopene content, fruit quality, virus resistance, cold stress tolerance, and thermotolerance.