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. 1980 Mar;65(3):415–421. doi: 10.1104/pp.65.3.415

Concentration and Metabolic Turnover of Indoles in Germinating Kernels of Zea mays L. 1

Ephraim Epstein 1,2, Jerry D Cohen 1, Robert S Bandurski 1,3
PMCID: PMC440345  PMID: 16661204

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.

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.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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