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Effect of Gibberellic Acid in Reducing Fe Chlorosis in Soybeans¹

Natural and artificial chelators appear to play a role in Fe availability. The addition of trace amounts of gibberellic acid (GA) to the culture solution in which soybean plants were growing with suboptimal levels of Fe increased the efficiency of Fe utilization by the plants. This increased efficiency was represented by a reduction of chlorosis symptoms. Possible explanations of this observation are reported. It appears that GA affects the internal metabolism of Fe and improves its activity as indicated by increased concentrations of chlorophyll. The mode of action of the GA is not clear, Apparently it does not chelate the Fe. The GA had its chlorosis-reducing effect when added to the culture solution but not when sprayed on the soybean leaves.

² Associate Professors of Agronomy, Department of Agronomy, Iowa State University, Ames, Iowa.

Received for publication September 4, 1965.