METHOD: Light Stress CONDITIONS: Lab - 12h light at 18C with 70-80% RH METHOD NARR: Plants initially grown at 18C were transferred to either 12 or 24C for 4 weeks. Leaf tissue was the subjected to low temp and either high lightptake was measured in the dark chamber followed by light-limited and light-saturated Oxygen evolution. Chl was extacted and quantitated. RESULTS NARR: Acclimation of tbr to lower temp with constant light results in the inetic tissue to tolerate high light stress at low temps. Cmm has a much greater tolerance to high light stress at chilling than does tbr after growth at 24C. AUTHOR EXPLANATION: Plant adaptations which would reduce light trapse the capacity for light energy utilization would appear to provide greater protection of the photosynthetic apparatus during sudden changes in the light and/or temperature environment. This work shows that light limited photosynthesve indicator of initial photoinhibitory injuy than is light-saturated photosynthesis.