Used in plant biology research to quantify glutamine synthetase (GS) enzyme levels in plant tissues. This assay helps assess nitrogen metabolism efficiency, particularly in studies related to plant growth, nutrient uptake, and stress responses. Researchers use it to evaluate how different environmental conditions, such as drought, salinity, or nitrogen availability, affect GS activity. It is also applied in genetic studies to compare GS expression in transgenic or mutant plants versus wild types. The kit supports high-throughput analysis in agricultural and environmental research aiming to improve crop yield and nitrogen use efficiency.