Plant Physiol. Drug Metab Dispos
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Plant Physiology 69:1304-1307 (1982)
© 1982 American Society of Plant Biologists

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Articles

Distribution of Free and Ester Indole-3-Acetic Acid in the Cortex and Stele of the Zea mays Mesocotyl 1

William L. Pengelly2, Prudence J. Hall, Aga Schulze and Robert S. Bandurski3

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

The distribution of free and ester-linked indole-3-acetic acid (IAA) in the vascular stele and cortex-epidermis of the Zea mays mesocotyl was measured by gas chromatography-selected ion monitoring-mass spectrometry and by radioimmunoassay with good agreement between the two assay methods. On a per plant basis, 72% of the free IAA was found in the stele and 28% was in the cortex, whereas 80% of the ester IAA was in the cortex with 20% localized in the stele. On a fresh weight basis, the concentration of free IAA was 15 to 28 times higher in the stele than in the cortex, whereas the concentration of ester IAA was similar in the two tissues. The concentration of free IAA in the apical portion of the cortex was 3 times higher than in the basal portion, and this distribution correlated with the relative growth rates of the apical and basal portions of the mesocotyl. No changes in the longitudinal distribution of ester IAA were found in either the cortex or stele.

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

3 To whom reprint requests should be directed.

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 10078 from the Michigan Agricultural Experiment Station.




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A. Jakubowska and S. Kowalczyk
The auxin conjugate 1-O-indole-3-acetyl-{beta}-D-glucose is synthesized in immature legume seeds by IAGlc synthase and may be used for modification of some high molecular weight compounds
J. Exp. Bot., April 1, 2004; 55(398): 791 - 801.
[Abstract] [Full Text] [PDF]


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Copyright © 1982 by the American Society of Plant Biologists