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Gravitational effects on plant growth hormone concentrationDolk's (1936) finding that more growth hormone diffuses from the lower side of a gravity-stimulated plant shoot than from the upper side is presently confirmed by means of both an isotope dilution assay and selected ion monitoring-gas chromatography-mass spectrometry, and it is established that the asymmetrically distributed hormone is indole-3-acetic acid (IAA). This is the first physicochemical demonstration that there is more IAA on the lower sides of a geostimulated plant shoot. It is also found that free IAA primarily occurs in the conductive vascular tissues of the shoot, while IAA esters predominate in the growing cortical cells. A highly sensitive gas chromatographic isotope dilution assay shows that the hormone asymmetry also occurs in the nonvascular tissue.
Document ID
19830060834
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bandurski, R. S.
(Michigan State Univ. East Lansing, MI, United States)
Schulze, A.
(Michigan State University East Lansing, MI, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Publication Information
ISSN: 0273-1177
Subject Category
Life Sciences (General)
Accession Number
83A42052
Funding Number(s)
CONTRACT_GRANT: NAGW-97
CONTRACT_GRANT: NSF PCM-79-04637
CONTRACT_GRANT: NASA ORDER 25796
Distribution Limits
Public
Copyright
Other

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