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Plant Physiology 50:80-86 (1972)
© 1972 American Society of Plant Biologists

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Articles

The Relative Amounts and Identification of Some 2,4-Dichlorophenoxyacetic Acid Metabolites Isolated from Soybean Cotyledon Callus Cultures 1

Chao-Shieung Feung, Robert H. Hamilton, Francis H. Witham and Ralph O. Mumma

a Departments of Biology and Entomology, The Pennsylvania State University, University Park, Pennsylvania 16802

Soybean (Glycine max L.) cotyledon callus grown on radioactive 2,4-dichlorophenoxyacetic acid (2,4-D-1-14C) as an auxin produced 2,4-D metabolites, which qualitatively and quantitatively changed with time. Water soluble fractions from the tissue exhibited a steady increase in radioactivity during the course of 24 days. Following {beta}-glucosidase treatment, at least eight aglycones were obtained from the water soluble fraction of the tissue after 8 days. The metabolite, 4-hydroxy-2,5-dichlorophenoxyacetic acid was the most abundant aglycone during the entire 32 day growth period while 4-hydroxy-2,3-dichlorophenoxyacetic acid was detected as a minor metabolite. Radioactivity in the ether soluble acidic fractions reached a maximum of 82% of the total in the tissue after 2 days. The level then decreased to 44% by the end of 24 days. A total of seven ether soluble components were detected. In addition to 2,4-D glutamic acid, which was detected in high amounts after 24 hours, 2,4-D aspartic acid was found to be the most abundant ether soluble metabolite after longer time periods. Mass spectral data and a fragmentation pattern are presented for 2,4-D aspartic acid.

1 Contribution No. 78 from the Department of Biology, The Pennsylvania State University and Paper No. 4047 from the Pennsylvania Agricultural Experiment Station.






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Copyright © 1972 by the American Society of Plant Biologists