PSY — Solanum lycopersicum

Summary

SOLYC02G081330.4 (PSY) encodes a protein with phytoene synthase, squalene synthase, dimethylallyltransferase and farnesyltranstransferase activities, and belongs to the isoprenoid synthase domain superfamily. In tomato, PSY is associated with carotenoid pigmentation, fruit pigmentation, lycopene biosynthesis, and stress response. The gene is linked to phytoene, beta-carotene, capsanthin, apocarotenoid and vitamin A anabolism, as well as lutein breakdown and chromoplast organization. PSY localizes to plastids, including etioplasts and chromoplast stroma, and also associates with chloroplast membranes, mitochondria, cytosol and nucleus. Associations include fruit quality, ripening, color, firmness, weight, shape and size, lycopene, carotene, lutein, neoxanthin, alpha-carotene and flavonoid content, abscisic acid concentration, photosynthetic rate, quantum yield, stomatal resistance, ethylene sensitivity, sugar content, seed maturation and dormancy, chloroplast development, drought tolerance, and cell elongation.