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Effect of inhibitors of auxin transport and of calmodulin on a gravisensing-dependent current in maize rootsSome characteristics of the gravity sensing mechanism in maize root caps were investigated using a bioelectric current as an indicator of gravity sensing. This technique involves the measurement of a change in the current density which arises at the columella region coincidently with the presentation time. Two inhibitors of auxin transport, triiodobenzoic acid and naphthylphthalamic acid, blocked gravitropic curvature but not the change in current density. Two inhibitors of calmodulin activity, compound 48/80 and calmidazolium, blocked both curvature and gravity-induced current. The results suggest that auxin transport is not a component of gravity sensing in the root cap. By contrast, the results suggest that calmodulin plays an intrinsic role in gravity sensing.
Document ID
20040089643
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bjorkman, T.
(Boyce Thompson Institute, Cornell University Ithaca, New York 14853-1801, United States)
Leopold, A. C.
Date Acquired
August 21, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Plant physiology
Volume: 84
ISSN: 0032-0889
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Plant Biology
NASA Program Space Biology
NASA Discipline Number 40-10

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