PSY — Sorghum bicolor

Summary

SORBI_3002G292600 (SbPSY) on sorghum chromosome 2 encodes a phytoene synthase (EC 2.5.1.32) with squalene synthase, phytoene synthase, and farnesyltranstransferase activities, belonging to the trans-isoprenyl diphosphate synthase family. The gene is associated with carotenoid anabolism and breakdown, photoprotection, and response to abscisic acid, and its product localizes to the chloroplast membrane, chromoplast stroma, and plastoglobules. SbPSY is linked to carotenoid content and drought stress response. Studies of related genes in other species connect the family to beta-carotene, lutein, zeaxanthin, and abscisic acid concentrations, as well as agronomic traits including grain yield, grain weight, grain number, grain protein content, test weight, seed germination, and drought and salt tolerance.