GS1 — Oryza sativa Indica Group

Summary

BGIOSGA009926 (GS1) in indica rice encodes a glutamine synthetase, an enzyme that catalyzes the formation of L-glutamine from L-glutamate and ammonia, and is also annotated with glutamyl-tRNA aminoacylation activity. The gene is associated with nitrogen utilization and recycling, leaf senescence, and responses to abscisic acid and cadmium. GS1 has been linked to key agronomic traits including grain weight, grain length, grain yield, panicle weight, spikelet weight, and grain filling period, as well as photosynthetic rate and stomatal opening. It is also associated with salt and drought tolerance. The protein localizes to multiple cellular compartments including the chloroplast thylakoid membrane, cytosol, and apoplast. Studies of related genes in other species link the glutamine synthetase family to nitrogen assimilation, seedling vigour, and grain nitrogen content.