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Determines the combined effects of chronic ozone and elevated carbon dioxide on ribulose 1,5 bisphosphate carboxylase oxygenase (Rubisco) activity and leaf components in soybean, Glycine max. Interaction between ozone and carbon dioxide; Acceleration of leaf senescence in ozone-fumigated leaves; Deactivation of Rubisco by elevated carbon dioxide levels; Interaction between carbon dioxide and ozone in response to starch and sucrose metabolism.

Investigates the major limitations to carbon dioxide assimilation of soybean under conditions of elevated atmospheric carbon dioxide and tropospheric ozone. Assimilation, rubisco carboxylation and chlorophyll content of soybean over one growing season; Limitations of soybean to the potential assimilation rate; Effects of carbon dioxide, tropospheric ozone and ontogeny on the limits of photosynthesis.