Used for the quantitative measurement of L-SPMS (Spermidine Synthase) enzyme activity in plant tissue extracts. This ELISA kit enables researchers to assess polyamine biosynthesis levels, which are critical for plant growth, development, and stress responses. It is widely applied in plant physiology and molecular biology studies to evaluate how environmental stresses such as drought, salinity, or pathogen attack affect spermidine production. The assay supports high-throughput analysis, making it suitable for screening transgenic plants or mutant lines with altered polyamine metabolism. Results help in understanding plant defense mechanisms and improving crop resilience through metabolic engineering.