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Science 16 August 1996:
Vol. 273. no. 5277, pp. 948 - 950
DOI: 10.1126/science.273.5277.948
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Reports

Arabidopsis AUX1 Gene: A Permease-Like Regulator of Root Gravitropism

Malcolm J. Bennett, * Alan Marchant, Haydn G. Green, Sean T. May, Sally P. Ward, Paul A. Millner, Amanda R. Walker, Burkhard Schulz, dagger Kenneth A. Feldmann

The plant hormone auxin regulates various developmental processes including root formation, vascular development, and gravitropism. Mutations within the AUX1 gene confer an auxin-resistant root growth phenotype and abolish root gravitropic curvature. Polypeptide sequence similarity to amino acid permeases suggests that AUX1 mediates the transport of an amino acid-like signaling molecule. Indole-3-acetic acid, the major form of auxin in higher plants, is structurally similar to tryptophan and is a likely substrate for the AUX1 gene product. The cloned AUX1 gene can restore the auxin-responsiveness of transgenic aux1 roots. Spatially, AUX1 is expressed in root apical tissues that regulate root gravitropic curvature.

M. J. Bennett, A. Marchant, H. G. Green, S. T. May, S. P. Ward, Department of Biological Sciences, University of Warwick, Coventry, CV4 7AL, UK.
P. A. Millner, Department of Biochemistry and Molecular Biology, University of Leeds, Leeds, West Yorkshire, UK.
A. R. Walker, Department of Plant Sciences, University of Cambridge, Cambridge, UK.
B. Schulz and K. A. Feldmann, Department of Plant Sciences, University of Arizona, Tucson, AZ 85721, USA.
*   To whom correspondence should be addressed. E-mail: bt{at}dna.bio.warwick.ac.uk

dagger    Present address: Botany Institute, University of Cologne, 50931 Cologne, Germany.


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L. E. Rogg, J. Lasswell, and B. Bartel (2001)
PLANT CELL 13, 465-480
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Chromosaponin I Specifically Interacts with AUX1 Protein in Regulating the Gravitropic Response of Arabidopsis Roots.
A. Rahman, A. Ahamed, T. Amakawa, N. Goto, and S. Tsurumi (2001)
Plant Physiology 125, 990-1000
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Genetic Analysis of Indole-3-butyric Acid Responses in Arabidopsis thaliana Reveals Four Mutant Classes.
B. K. Zolman, A. Yoder, and B. Bartel (2000)
Genetics 156, 1323-1337
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Families of transmembrane transporters selective for amino acids and their derivatives.
M. H. Saier Jr (2000)
Microbiology 146, 1775-1795
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The use of mutants to probe models of gravitropism.
R. D. Firn, C. Wagstaff, and J. Digby (2000)
J. Exp. Bot. 51, 1323-1340
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Polarity and signalling in plant embryogenesis.
M. Souter and K. Lindsey (2000)
J. Exp. Bot. 51, 971-983
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Auxin-induced K+ channel expression represents an essential step in coleoptile growth and gravitropism.
K. Philippar, I. Fuchs, H. Luthen, S. Hoth, C. S. Bauer, K. Haga, G. Thiel, K. Ljung, G. Sandberg, M. Bottger, et al. (1999)
PNAS 96, 12186-12191
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Functional Characterization and Expression Analysis of the Amino Acid Permease RcAAP3 from Castor Bean.
A. Neelam, A. C. Marvier, J.L. Hall, and L. E. Williams (1999)
Plant Physiology 120, 1049-1056
   Abstract »    Full Text »


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