Ecophysiological measurements are conducted with the LI-COR LI-6400XT portable photosynthesis system. The LI-6400XT is capable of measuring leaf gas exchange while adjusting and controlling light, temperature, humidity and CO2 concentrations experienced by the plant leaf. The system is generally used to measure key photosynthesis parameters such as instantaneous photosynthesis and transpiration, stomatal conductance and maximum rates of carboxylation and electron transport. Other experiments are conducted to establish light, CO2 and temperature response curves as well as the rate at which stomatal conductance adjust to changes in light intensity.