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. 1996 Aug 16;273(5277):948-50.
doi: 10.1126/science.273.5277.948.

Arabidopsis AUX1 gene: a permease-like regulator of root gravitropism

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Arabidopsis AUX1 gene: a permease-like regulator of root gravitropism

M J Bennett et al. Science. .

Abstract

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.

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