Plant Physiol. Drug Metab Dispos
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Plant Physiology 73:445-449 (1983)
© 1983 American Society of Plant Biologists

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Analysis of Indole-3-acetic Acid Metabolism in Zea mays Using Deuterium Oxide as a Tracer 1

William L. Pengelly2 and Robert S. Bandurski

Department of Botany and Plant Pathology, Michigan State University, East Lansing, Michigan 48824

A method using deuterium oxide (D2O) as a tracer was used to study indole-3-acetic acid (IAA) metabolism in Zea mays seedlings. Seeds were imbibed and grown for 4 days in 30% D2O in the dark. IAA was then isolated from roots and shoots and analyzed for deuterium content by mass spectrometry. We found that a significant portion of the IAA isolated from plants had incorporated deuterium at nonexchangeable sites of the indole ring. This indicates that some of the IAA in the germinating seedling is made via de novo indole synthesis. Moreover, we found that the deuterium content of IAA was 2.6 times greater in shoots than in roots. These results indicate that at least some of the IAA in roots and shoots came from different biosynthetic pathways. It appears that the fraction of IAA produced via de novo indole synthesis is greater in shoots than in roots.

2 Present address and address for reprints and correspondence: Department of Chemistry and Biochemical Sciences, Oregon Graduate Center, 19600 N.W. Walker Road, Beaverton, OR 97006.

1 Supported by the Metabolic Biology Section of the National Science Foundation, PCM 79-04637, and by the National Aeronautics and Space Administration, NAGW-97-ORD 25796. This paper is Journal Article 10790 from the Michigan Agricultural Experiment Station.




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