Louisiana State University AgCenter 1 article published in JoVE Biology Evaluation of Photosynthetic Efficiency in Photorespiratory Mutants by Chlorophyll Fluorescence Analysis Joseph Qian1, Nicholas Ferrari1, Richard Garcia1, Mary Beth L. Rollins2, Paul F. South1,2 1Department of Biological Sciences, Louisiana State University, 2Department of Plant Pathology and Crop Physiology, Louisiana State University AgCenter We describe an approach to measure changes in photosynthetic efficiency in plants after treatment with low CO2 using chlorophyll fluorescence.