What is ELISA testing used for?

ELISA (Enzyme-Linked Immunosorbent Assay) testing is a highly sensitive and specific laboratory technique primarily used to detect the presence of antigens in a sample. This method is particularly valuable in plant pathology as it allows for the identification of specific pathogens, including viruses, bacteria, and fungi, by targeting unique proteins associated with these organisms.

In the context of plant health, the ability to detect antigens can aid in diagnosing infections early, which is crucial for effective management and control of plant diseases. ELISA can provide quantitative data on pathogen levels, which further assists in understanding disease severity and potential impacts on crop health and yield.

The other options reflect different processes or measurements not related to the primary function of ELISA. Amplifying plant DNA sequences typically involves methods like PCR (Polymerase Chain Reaction). Determining nutrient levels in soil is conducted through soil tests, while measuring light absorption in plant leaves is usually done using spectrophotometry or chlorophyll meters. Therefore, the correct choice focuses on the specific application of ELISA in detecting antigens, making it a vital tool in agricultural and environmental diagnostics.