Used in plant physiology research to quantify the activity of pheophorbide a oxygenase (PAO), an enzyme involved in chlorophyll breakdown. This ELISA kit enables accurate measurement of PAO levels in plant tissues, supporting studies on leaf senescence, stress responses, and nutrient recycling in plants. It is widely applied in agricultural and environmental research to understand how plants degrade chlorophyll during aging or under abiotic stress such as drought, light exposure, or pathogen attack. The assay is suitable for high-throughput analysis in laboratories studying plant metabolism and development.