Used to measure histidine kinase (HK) activity in plant samples, this ELISA kit helps researchers study plant signaling pathways, especially those involved in stress responses and hormone regulation like ethylene and cytokinin signaling. It enables quantitative analysis of HK enzyme activity in roots, leaves, and other tissues under various environmental conditions such as drought, salinity, or pathogen attack. Commonly used in agricultural research and plant physiology to evaluate how genetic modifications or external treatments affect signal transduction, making it valuable for developing stress-resistant crop varieties.