Used in molecular biology and plant research to detect and quantify RNA polymerase II activity in plant samples. Helps study gene expression mechanisms, particularly in response to environmental stresses, hormonal signals, or pathogen attacks. Enables researchers to monitor transcriptional regulation by measuring phosphorylation states or protein levels of RNAP II. Widely applied in academic and agricultural research to understand plant development, stress adaptation, and epigenetic regulation. Suitable for high-throughput screening in experiments involving transgenic plants or mutant lines.