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Gravitropism in higher plant shoots. IV - Further studies on participation of ethyleneVarious hypotheses regarding the influence of ethylene on gravitropism in higher plant shoots were experimentally tested. It was found that ethylene at 1.0 and 10.0 cu cm/cu m decreased the rate of gravitropic bending in cocklebur stems, while 0.1 cm/cu m of ethylene had little effect. Treating cocklebur plants with 1.0 mmol aminoethoxyvinylglycine (AVG, an ethylene synthesis inhibitor) delayed stem bending compared with controls, but adding 0.1 cu cm/cu m ethylene in the surrounding atmosphere partially restored the rate of bending of AVG-treated plants. Virtually all newly synthesized ethylene appeared in bottom halves of horizontal stems, where ethylene concentrations were as much as 100 times those in upright stems or in top halves of horizontal stems. Auxin applied to one side of a vertical stem caused extreme bending away from that side; gibberellic acid, kinetin, and abscisic acid were without effect.
Document ID
19920055480
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wheeler, Raymond M.
(NASA Headquarters Washington, DC United States)
White, Rosemary G.
(NASA Headquarters Washington, DC United States)
Salisbury, Frank B.
(Utah State University Logan, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1986
Publication Information
Publication: Plant Physiology
Volume: 82
ISSN: 0032-0889
Subject Category
Life Sciences (General)
Accession Number
92A38104
Funding Number(s)
CONTRACT_GRANT: NSG-7567
Distribution Limits
Public
Copyright
Other

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