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Agronomic Significance and Genetic Variability of ATP Sulfurylase Activity in Soybeans [Glycme max (L.) Merr.]¹

The relationship between N/S ratios and ATP sulfurylase activity indicates that S content does not control enzyme activity once adequate sulfur is present. N metabolism may be the limiting factor. This is consistent with the known lack of response to sulfur fertilization once adequate levels have been attained. A survey of ATP sulfurylase activity in six commercial varieties and 20 soybean [Glycine max (L.) Merrill] lines indicated wide differences in activity. The activity is likely under genetic control. ATP sulfurylase activity did not correlate with seed protein content or with methionine content of the seed protein.

Key Words: Sulfur • Soybean varieties

² Formerly Research Assistant, Department of Agronomy, University of Illinois, present address: Department of Agricultural Biochemistry, Waite Agricultural Institute, University of Adelaide, Adelaide, Australia; Plant Physiologist, Crops Research Division, ARS, USDA, Urbana, Illinois, and Associate Professor of Plant Physiology, Department of Agronomy, University of Illinois, Urbana, Illinois 61801.

Received for publication October 6, 1969.