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Plant and Cell Physiology, 1986, Vol. 27, No. 8 1513-1522
© 1986

Article

Dioxindole-3-Acetic Acid Conjugates Formation from Indole-3-Acetylaspartic Acid in Vicia Seedlings

Seiji Tsurumi1 and Shunji Wada2

1Division of Science of Biological Resources, The Graduate School of Science and Technology, Kobe University Rokkodai, Kobe 657, Japan
2Biological Institute, Faculty of Science, Tohoku University Sendai 980, Japan

When indole-3-acetic acid (IAA) is applied to the cotyledons of broad bean seedlings (Vicia faba L. cv Chukyo), the major metabolites found in the roots are 3-(O-ß-glucosyl)- 2-indoIone-3-acetylaspartic acid (Glc-DIA-Asp) and 3-hydroxy-2-indolone-3-acetylaspartic acid (DIA-Asp). In this report, the metabolic pathway from IAA to the two dioxindole-3-acetic acid (DIA) conjugates was investigated by using [14C]IAA, [14C]DIA, [14C]indole-3-acetylaspartic acid (IAA-Asp), and [14C]IAA-[3H]Asp. The precursor of DIA-Asp was found to be IAA-Asp but not DIA. Incorporation of the double labeled IAA-Asp into the DIA conjugates demonstrated that hydrolysis of IAA-Asp was not involved in the formation of the DIA conjugates. DIA-Asp was further metabolized to Glc-DIA-Asp in the cotyledons, while formation of Glc-DIA-Asp in the roots was very low. Glc-DIA-Asp formed in the cotyledons was transported to the roots.

(Received April 21, 1986; Accepted September 10, 1986)
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