GLU — Sorghum bicolor

Summary

SbGLU (SORBI_3002G402700) on sorghum chromosome 2 encodes a ferredoxin-dependent glutamate synthase (Fd-GOGAT; EC 1.4.7.1), a central enzyme in nitrogen assimilation that catalyzes the conversion of glutamine and 2-oxoglutarate into two molecules of glutamate. The gene is associated with glutamate biosynthesis, the ammonia assimilation cycle, and photorespiratory metabolism, as well as responses to light, cold, sucrose, and brassinosteroid signalling. It has been linked to agronomically important traits including grain filling, photosynthetic rate, leaf senescence, aluminum tolerance, nitrate uptake, and salt tolerance. The encoded protein localizes to chloroplast stroma, thylakoid, and envelope, and is also associated with amyloplasts, stromules, and the apoplast. Studies of related genes in other species connect the Fd-GOGAT family to grain quality, nitrogen recycling, drought and salt stress responses, and organ size.