PMID:10205161

Citation	Marchant, A, Kargul, J, May, ST, Muller, P, Delbarre, A, Perrot-Rechenmann, C and Bennett, MJ (1999) AUX1 regulates root gravitropism in Arabidopsis by facilitating auxin uptake within root apical tissues. EMBO J. 18:2066-73
Abstract	Plants employ a specialized transport system composed of separate influx and efflux carriers to mobilize the plant hormone auxin between its site(s) of synthesis and action. Mutations within the permease-like AUX1 protein significantly reduce the rate of carrier-mediated auxin uptake within Arabidopsis roots, conferring an agravitropic phenotype. We are able to bypass the defect within auxin uptake and restore the gravitropic root phenotype of aux1 by growing mutant seedlings in the presence of the membrane-permeable synthetic auxin, 1-naphthaleneacetic acid. We illustrate that AUX1 expression overlaps that previously described for the auxin efflux carrier, AtPIN2, using transgenic lines expressing an AUX1 promoter::uidA (GUS) gene. Finally, we demonstrate that AUX1 regulates gravitropic curvature by acting in unison with the auxin efflux carrier to co-ordinate the localized redistribution of auxin within the Arabidopsis root apex. Our results provide the first example of a developmental role for the auxin influx carrier within higher plants and supply new insight into the molecular basis of gravitropic signalling.
Links	PubMed PMC1171291 Online version:10.1093/emboj/18.8.2066
Keywords	Arabidopsis/metabolism; Arabidopsis/physiology; Arabidopsis Proteins; Biological Transport; Gravitropism; Indoleacetic Acids/metabolism; Phenotype; Plant Proteins/physiology; Plant Roots/metabolism; Plants, Genetically Modified; Signal Transduction
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
ARATH:AUX1		GO:0009958: positive gravitropism	ECO:0000269:		P		figure 3 shows that AUX1 restores gravitropic root growth.	complete CACAO 4348

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