scholarly journals ABSORPTION OF SULPHUR DIOXIDE BY ALFALFA AND ITS RELATION TO LEAF INJURY

1935 ◽  
Vol 10 (2) ◽  
pp. 291-307 ◽  
Author(s):  
Moyer D. Thomas ◽  
Geo. R. Hill
Keyword(s):  
Sulphur Dioxide ◽  
Leaf Injury

OZONE AND SULPHUR DIOXIDE INTERACTION IN WHITE BEAN AND SOYBEAN

1977 ◽  
Vol 57 (4) ◽  
pp. 1193-1198 ◽  
Author(s):  
G. HOFSTRA ◽  
D. P. ORMROD
Keyword(s):  
Sulphur Dioxide ◽  
Controlled Environment ◽  
Plant Weight ◽  
Leaf Injury ◽  
Mature Leaves ◽  
Bean Plants ◽  
White Bean ◽  
Glycine Max L ◽  
Soybean Leaves ◽  
Weight Data

White bean (Phaseolus vulgaris L.) and soybean (Glycine max L. Merr.) plants were exposed to 15 pphm (v/v) ozone and/or 7.5, 15, 30, 45 or 60 pphm sulphur dioxide for 5 or 10 days in controlled environment facilities. Ozone-induced leaf injury consisted of bronze flecking on mature leaves of both species. Sulphur dioxide caused bifacial necrotic lesions on mature leaves of some white bean plants exposed to 60 pphm and had no effect on soybean leaves. The combined gases on white bean resulted in leaf injury symptoms consisting of yellow interveinal chlorosis which appeared several days later than did bronzing on corresponding leaves exposed to ozone alone. In soybean, characteristic ozone-induced lesions appeared on leaves of plants exposed to the combined gases but the onset of injury was several days later than in plants exposed only to ozone. Both injury ratings and plant weight data corresponded to the observed injury pattern.

THE INTERACTION OF COPPER AND SULPHUR DIOXIDE IN PLANT INJURY

1979 ◽  
Vol 59 (2) ◽  
pp. 475-479 ◽  
Author(s):  
P. M. A. TOIVONEN ◽  
G. HOFSTRA
Keyword(s):  
Plant Growth ◽  
Sulphur Dioxide ◽  
Relative Sensitivity ◽  
Stomatal Resistance ◽  
Leaf Injury ◽  
Stunted Growth ◽  
Barley Cultivars ◽  
Rooting Medium ◽  
Plant Injury

Barley cultivars were assessed for relative sensitivity to SO2. The most SO2-sensitive cultivar, Laurier, was used to study the effects of Cu in the rooting medium on plant growth. Copper stunted growth, especially of the roots, and induced leaf injury starting at the leaf tips. The cultivar Laurier, grown in a medium watered with 0, 10, 50 and 100 ppm Cu as CuSO4∙5H2O, was exposed to 1.0 ± 0.1 ppm SO2 for 6 and 7 h on 2 consecutive days. Less injury due to SO2 was observed at the higher Cu concentration. The higher levels of Cu greatly increased stomatal resistance, thereby reducing SO2 uptake.

Temporal Patterns of Acidification of Rivers in Nova Scotia and Newfoundland and their Relationship to Sulphate Emissions

1988 ◽  
Vol 23 (4) ◽  
pp. 532-541
Author(s):  
G. D. Howell ◽  
P.E.J. Green ◽  
C.A. Field ◽  
B. Freedman
Keyword(s):  
Statistical Analysis ◽  
Nova Scotia ◽  
Water Chemistry ◽  
Sulphur Dioxide ◽  
Low Ph ◽  
Hydrogen Ion ◽  
Atlantic Canada ◽  
Atmospheric Loading ◽  
Mineral Acids ◽  
Sulphur Dioxide Emission

Abstract Twenty-eight rivers in Atlantic Canada are sampled monthly, and have periods of record dating back as far as 1965. Statistical analysis of water chemistry for rivers in areas of Nova Scotia and Newfoundland that are believed to be sensitive to acidification has revealed that pH was significantly lower during the late 1960’s and early 1970’s. Annual hydrogen ion export for selected rivers was also greater during this period. This period of relatively low pH and large hydrogen ion export corresponds to a peak of North American sulphur dioxide emission, suggesting that these rivers may be responding to atmospheric loading of anthropogenic mineral acids.

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