Concentration and Metabolic Turnover of Indoles in Germinating Kernels of Zea mays L |
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| Authors: | Epstein E Cohen J D Bandurski R S |
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| Affiliation: | Department of Botany and Plant Pathology, Michigan State University, East Lansing, Michigan 48824. |
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| Abstract: | The amounts and rates of metabolic turnover of the indolylic compounds in germinating kernels of sweet corn were determined. Knowledge of pool size and rate of pool turnover has permitted: (a) identification of indole-3-acetyl-myo-inositol as the major chemical form for transport of indole-3-acetic acid (IAA) from endosperm to shoot; (b) demonstration that the free IAA of the endosperm is turning over rapidly with a half-life of 3.2 hours; (c) identification of esters of IAA as the immediate precursors of IAA in the endosperm and shoot; (d) demonstration that neither tryptophan nor tryptamine is a major precursor of IAA for the seed or shoot; (e) identification of IAA-myo-inositol glycosides as precursors of IAA-myo-inositol. |
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