Genome-Wide Characterization, Expression Profiling and Source-Sink Nitrogen Responses of Rice Glutamine Synthetase Gene Family.
BACKGROUND Nitrogen is the most abundant mineral nutrient required by rice (Oryza sativa) and the primary limiting factor for grain yield. Glutamine synthetase (GS) is a key enzyme involved in nitrogen assimilation in rice, and is closely associated with nitrogen use efficiency (NUE) and source-sink nitrogen dynamics....