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Exposure of Parmelia chlorochroa and Collema polycarpon to 1 and 2 ppm gaseous SO 2 (4‐, 8‐, and 12‐hr fumigations) initially stimulated photosynthesis but prolonged exposure depressed it. Carbohydrate transfer decreased in both species but increased significantly after a 12‐hr exposure in C. polycarpon. Interference with normal oxidation‐reduction and denaturation of enzymes and membrane proteins by sulfite and bisulfite ions may account for the observed results. Increased conductivity of leachates reflected SO 2 ‐induced damage at both 1 and 2 ppm sO 2 .
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Fields et al. (1984) studied this question.
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