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Role of auxin and protons in plant shoot gravitropismExperiments designed to probe the relationship between asymmetric acid efflux and auxin redistribution during gravitropism are reported. Gravistimulation of sunflower hypocotyls results in the retardation of growth on the upper surface and the acceleration of growth on the lower surface relative to a vertically oriented control. Auxin and H(+) both elicit growth over a similarly broad region of the hypocotyl. The correspondence between auxin, H(+), and gravisensitive tissues is consistent with the notion that auxin redistribution may initiate asymmetric acid efflux during gravistimulation. Data are presented showing a redistribution of C-14-IAA and H-3-IAA occurs within 20-30 minutes of gravistimulation. Data on the effects of selected inhibitors of shoot gravitropism are also presented. Taken together, the data suggest that lateral transport of auxin initiates asymmetric acid efflux in gravitropically stimulated shoots.
Document ID
19830046595
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rayle, D. L.
(San Diego State Univ. San Diego, CA, United States)
Migliaccio, F.
(San Diego State Univ. San Diego, CA, United States)
Watson, E.
(San Diego State University San Diego, CA, United States)
Date Acquired
August 11, 2013
Publication Date
December 1, 1982
Subject Category
Life Sciences (General)
Accession Number
83A27813
Funding Number(s)
CONTRACT_GRANT: NAGW-230
Distribution Limits
Public
Copyright
Other

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