A study of the effects of ozone and sulfur dioxide on the photosynthesis and respiration of Euglena gracilis

Observations on the Effect of Ozone on Cladonia Rangiformis

“…O 3 (Pell and Brennan, 1973), Euglena gracilis 15% after 1 h in 1 p.p.m. O 3 (DeKoning and Jegier, 1968) and Lemna minor 15% after 4 h in 1 p.p.m. O 3 (Erickson and Wedding, 1956.…”

Air pollution and microbial ecology

“…353 Ozone was destructive to the chlorophyll 'b' content of the algal cell, 354 whereas exposure to 5 ppm SO 2 for 1 hr decreased the photosynthetic rate, and yet increased the chlorophyll 'a' content of the algal cell. 352 ' 353 Combined exposure to 0.5 ppm O 3 and 2.2 ppm SO 2 for 1 hr did not influence the algal photosynthetic rate, whereas exposures to 0.5 ppm O3 and 5 ppm SO 2 for 1 hr decreased the photosynthetic rate. Thus, the effect of SO 2 plus O 3 was equal to the effects of each individual pollutant.…”

“…Exposure of the alga, Euglena gracilis, to either 5 ppm SO2 or 1 ppm O 3 for 1 hr, resulted in reductions in photosynthetic rates and increases in respiration rates. 352 However, exposures to 1 or 2 ppm SO 2 increased the photosynthetic rate of the alga. 353 Ozone was destructive to the chlorophyll 'b' content of the algal cell, 354 whereas exposure to 5 ppm SO 2 for 1 hr decreased the photosynthetic rate, and yet increased the chlorophyll 'a' content of the algal cell.…”

Effect of Sulphur Dioxide on the Metabolism of Glycollic Acid by Barley (Hordeum Vulgare) Leaves

“…Most of this work reports visual changes in leaf structure or quantitative changes in individual metabolites. However, the effects of S02 on the overall metabolic processes which go to make up both photosynthesis and respiration have been investigated; photosynthetic rate is retarded with increasing S02 concentration whilst respiration is increased or decreased depending upon the S02 concentration (Katz 1949; de Koning and Jegier 1968).…”