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- W2107538963 abstract "Soybean (Glycine max (L.) Merr. ’Essex’) plants, 21–24 days old, were exposed to 400 μg/m 3 (0.20 μL/L) ozone (O 3 ) and 1865 μg/m 3 (0.70 μL/L) sulfur dioxide (SO 2 ) in various combinations. Fumigation was administered for 2 h either as single pollutants (O 3 and SO 2 ), simultaneously (O 3 + SO 2 ), or in overlapping pollutant combinations (O 3 for 1 h followed by O 3 + SO 2 or SO 2 for 1 h followed by SO 2 + O 3 ). Carbon dioxide exchange rates (CER) of trifoliolate leaves were measured during the fumigations, and stomatal resistance to H 2 O was determined immediately before and after pollutant exposure. At the end of a 2-h exposure, O 3 and SO 2 , administered separately, did not significantly affect CER. Exposure to O 3 followed by O 3 + SO 2 , SO 2 followed by SO 2 + O 3 , and continuous O 3 + SO 2 significantly reduced CER to 62, 41 and 33% of preexposure rates, respectively. Stomatal resistance was not significantly altered by pollutant fumigation except in the simultaneous application of O 3 + SO 2 where an 11% decrease occurred. Reductions in CER in response to fumigation were not attributed to changes in stomatal resistance, but appeared to result from changes in mesophyll resistance. A proposed mechanism for pollutant-induced reduction in CER is discussed.Key words: Air pollution, net photosynthesis, pollutant mixtures" @default.
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- W2107538963 date "1985-04-01" @default.
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- W2107538963 title "CO<sub>2</sub> EXCHANGE RATES AND STOMATAL DIFFUSIVE RESISTANCE IN SOYBEAN EXPOSED TO O<sub>3</sub> AND SO<sub>2</sub>" @default.
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- W2107538963 doi "https://doi.org/10.4141/cjps85-039" @default.
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