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Root gravitropism: a complex response to a simple stimulus?Roots avoid depleting their immediate environment of essential nutrients by continuous growth. Root growth is directed by environmental cues, including gravity. Gravity sensing occurs mainly in the columella cells of the root cap. Upon reorientation within the gravity field, the root-cap amyloplasts sediment, generating a physiological signal that promotes the development of a curvature at the root elongation zones. Recent molecular genetic studies in Arabidopsis have allowed the identification of genes that play important roles in root gravitropism. Among them, the ARG1 gene encodes a DnaJ-like protein involved in gravity signal transduction, whereas the AUX1 and AGR1 genes encode proteins involved in polar auxin transport. These studies have important implications for understanding the intra- and inter-cellular signaling processes that underlie root gravitropism.
Document ID
20040141819
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
Authors
Rosen, E.
(University of Wisconsin-Madison 53706 United States)
Chen, R.
Masson, P. H.
Date Acquired
August 22, 2013
Publication Date
October 1, 1999
Publication Information
Publication: Trends in plant science
Volume: 4
Issue: 10
ISSN: 1360-1385
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: 92-2033
CONTRACT_GRANT: NAG5-4596
CONTRACT_GRANT: NAG2-1189
Distribution Limits
Public
Copyright
Other
Keywords
Review, Tutorial
NASA Discipline Plant Biology
Non-NASA Center
Review

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