Plant Physiology 65:415-421 (1980)
© 1980 American Society of Plant Biologists
Articles
Concentration and Metabolic Turnover of Indoles in Germinating Kernels of Zea mays L. 1
Ephraim Epstein2,
Jerry D. Cohen and
Robert S. Bandurski3
Department of Botany and Plant Pathology, Michigan State University, East Lansing, Michigan 48824
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.
It is concluded that seedlings of Zea mays utilize esters of IAA, and not tryptophan or its derivatives, for the IAA requirements of the germinating seedling.
2 Accomplished this research while on sabbatical leave from the Department of Horticulture, The Volcani Center, Bet Dagan, Israel.
3 To whom reprint requests should be addressed.
1 This work was supported by grants from the Metabolic Biology Section of the National Science Foundation, PCM 76-12356. Journal Article 8953 from the Michigan Agricultural Experiment Station.
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