Low Temperatures

of reduced glutathione was detected and this decrease was fo11owed by a decrease in leyels of glucose 6-phesphate. When twigs that contained depressed leyels of reduced glutathione and glucose-6-phosphate were transferred to 40C, oyercompensation for the decrease in reduced glutathione and glucose-6-phosphate occurred and the resultant surplus appeared to reflect the metabolic dysfunction in the supply and demand for reduced glutathione and g]ucose-6-phosphate that occ"rs under frozen conditions. These results suggest that the sequence of reactions which starts from the reaction catalyzed by hexekinase, through reactions catalyzed by glucose-6-phosphate dehydrogenase and glutathione reductase, does not function properly under frozen conditions in perennial plants.