PSY — Sorghum bicolor

Summary

SORBI_3010G276400 (SbPSY, also known as SbPSY1) encodes a 15-cis-phytoene synthase, an enzyme with squalene/phytoene synthase activity (EC 2.5.1.32). This sorghum gene on chromosome 10 is associated with carotenoid anabolism and breakdown, isoprenoid anabolism, monoterpene biosynthesis, de-etiolation, response to light stimulus, and chromoplast and chloroplast organization. It has been linked to traits including photosynthetic rate, flowering time, chloroplast development, cell elongation, and embryo development. Associations also include alpha-carotene content, flour colour, and responses to osmotic, salt, and oxidative stress. The protein localizes to plastids, chloroplast membranes, etioplasts, chromoplast stroma, mitochondria, cytosol, and nucleus. Studies of related genes in other species connect the PSY family to grain yield, quality traits (e.g., beta-carotene, lutein, and grain protein content), seed maturation, cold tolerance, and thermotolerance.