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Articles

Concentrations of Abscisic Acid and Indole-3-Acetic Acid in Soybean Seeds during Development ¹

Department of Horticultural Science and Landscape Architecture, University of Minnesota, St. Paul, Minnesota 55108, Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55108

Concentrations of abscisic acid (ABA) and indole-3-acetic acid (IAA) in seed parts were determined during reproductive development of soybean plants (Glycine max [L.] Merr. cv `Chippewa 64'). The concentration of ABA and IAA changed independently in individual seed parts with time. Measurement of the level of ABA and IAA in whole seeds masked the changes which occurred in individual seed tissues. The concentration of ABA was generally highest and that of IAA was generally lowest in the embryonic axis of soybean seeds. In the testa, the IAA concentration was generally highest while the ABA concentration was generally the lowest compared to other parts of the seed.

¹ Supported in part by the United States Department of Agriculture under Grant 5901-0410-8-0183-0 from the Competitive Research Grants Office. Also supported in part by a grant from the Minnesota Soybean Research and Promotion Council. Contribution from the University of Minnesota Agricultural Experiment Station, St. Paul, MN 55108. Paper No. 13,712, Scientific Journal Series.

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