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THE EFFECTS OF SO 2 ON PHOTOSYNTHESIS AND CARBOHYDRATE TRANSFER IN THE TWO LICHENS: COLLEMA POLYCARPON AND PARMELIA CHLOROCHROA
Author(s) -
Fields Rebecca D.,
Clair Larry L. St.
Publication year - 1984
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1984.tb14165.x
Subject(s) - sulfite , biology , photosynthesis , bisulfite , carbohydrate , lichen , botany , biochemistry , environmental chemistry , chemistry , gene expression , gene , dna methylation
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 .