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Short‐Term Kinetic Studies on the Inhibition of Photosynthesis by Sulfur Dioxide
Author(s) -
Sij J. W.,
Swanson C. A.
Publication year - 1974
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1974.00472425000300020002x
Subject(s) - phaseolus , pinto bean , photosynthesis , chemistry , carbon dioxide , botany , zea mays , kinetics , dry bean , horticulture , agronomy , biology , physics , organic chemistry , quantum mechanics
Utilizing infrared gas analysis techniques, the effect of a 1‐hour exposure to 1, 3, or 5 ppm SO 2 on apparent photosynthesis in the primary leaf of Pinto bean ( Phaseolus vulgaris L. cv. Pinto) was studied as a function of three leaf ages. Generally, photosynthesis was reduced about 15, 70, and 90% for the respective concentrations regardless of leaf age. The initial inhibition of photosynthesis was not due to stomatal closure. Inhibition kinetics observed at 1 and 3 ppm SO 2 for Pinto bean ( Phaseolus vulgaris L.) were compared with those of SO 2 ‐tolerant corn ( Zea mays L.). At 1 ppm SO 2 , the kinetics of inhibition of photosynthesis for the two species were similar; however, at 3 ppm SO 2 , apparent photosynthesis in corn was inhibited less than in Pinto bean and recovered to a higher level following removal of SO 2 .