Used in plant biology research to quantify ferredoxin-NADP oxidoreductase (FNR) levels in photosynthetic tissues. Enables assessment of photosynthetic efficiency and electron transport chain activity under varying environmental conditions such as light intensity, temperature, and stress. Commonly applied in studies related to plant physiology, stress response, and genetic modification to evaluate chloroplast function. The ELISA format allows high-throughput analysis of FNR protein concentration in leaf extracts with high specificity and sensitivity.